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| Open AccessNear-room temperature ferromagnetic insulating state in highly distorted LaCoO2.5 with CoO5 square pyramids
Here, Zhang et al. succeed in creating a heavily distorted oxygen deficient film of lanthanum cobaltite. The new phase of LaCoO2.5 has several unique properties, most notably, a Curie temperature of 284 K, significantly larger than the films from which it was derived.
- Qinghua Zhang
- , Ang Gao
- & Lin Gu
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Article
| Open AccessPredicting orientation-dependent plastic susceptibility from static structure in amorphous solids via deep learning
Predicting a priori local defects in amorphous materials remains a grand challenge. Here authors combine a rotationally non-invariant structure representation with deep-learning to predict the propensity for shear transformations of amorphous solids for different loading orientations, only given the static structure.
- Zhao Fan
- & Evan Ma
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Article
| Open AccessExperimental evidence for the existence of a second partially-ordered phase of ice VI
Water ice exhibits several hydrogen-ordered and disordered phases and it’s unclear if a disordered phase can transform into only one ordered phase. Here, the authors identify a partially hydrogen-ordered phase at high pressure, ice XIX, as the second hydrogen-ordered phase of ice VI beside ice XV.
- Ryo Yamane
- , Kazuki Komatsu
- & Hiroyuki Kagi
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| Open AccessStructural characterization of ice XIX as the second polymorph related to ice VI
Water ice exhibits several hydrogen-disordered phases that become ordered upon lowering the temperature, but ordering of ice VI, one of the main ice phases, is not well understood. Here the authors identify and structurally refine a partially hydrogen-ordered phase, ice XIX, obtained from ice VI, and observe its transition to its partially hydrogen-ordered sibling ice XV.
- Tobias M. Gasser
- , Alexander V. Thoeny
- & Thomas Loerting
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| Open AccessMelting and density of MgSiO3 determined by shock compression of bridgmanite to 1254GPa
The authors here report high melting temperatures of MgSiO3 at 500 GPa by direct shockwave loading of pre-synthesized dense bridgemanite. This is essential data to understand the thermal evolution of the interiors of terrestrial (exo-)planets.
- Yingwei Fei
- , Christopher T. Seagle
- & Michael D. Furnish
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Article
| Open AccessInternal constraints and arrested relaxation in main-chain nematic elastomers
Nematic liquid crystal elastomers (N-LCE) have a slow relaxation, which can prevent their shape recovery. Here, the authors examine mechanical hysteresis in a series of main-chain N-LCE to understand how the inherent nematic order retards and arrests the equilibration.
- Takuya Ohzono
- , Kaoru Katoh
- & Eugene M. Terentjev
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Article
| Open AccessSynthesis of molecular metallic barium superhydride: pseudocubic BaH12
Metallization of pure hydrogen via overlapping of electronic bands requires high pressure above 3 Mbar. Here the authors study the Ba-H system and discover a unique superhydride BaH12 that contains molecular hydrogen, which demonstrates metallic properties and superconductivity below 1.5 Mbar.
- Wuhao Chen
- , Dmitrii V. Semenok
- & Tian Cui
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Article
| Open AccessLi1.5La1.5MO6 (M = W6+, Te6+) as a new series of lithium-rich double perovskites for all-solid-state lithium-ion batteries
The development of the all solid-state battery requires the formation of stable solid/solid interfaces between different battery components. Here the authors tailor the composition to form both electrolyte and anode from the same novel family of perovskites with shared crystal chemistry.
- Marco Amores
- , Hany El-Shinawi
- & Edmund J. Cussen
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Article
| Open AccessHigh frequency atomic tunneling yields ultralow and glass-like thermal conductivity in chalcogenide single crystals
Defect-free crystals showing the glassy trend of low thermal conductivity with a monotonic increase with temperature are desirable but rare. Here, the authors observe atomic tunneling associated with low and glass-like thermal conductivity in a hexagonal perovskite chalcogenide single-crystal BaTiS3.
- Bo Sun
- , Shanyuan Niu
- & Austin J. Minnich
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Article
| Open AccessIntertwined density waves in a metallic nickelate
Layered Ruddlesden-Popper structure nickelates R4Ni3O10 (R = La,Pr) show an unusual metal-to-metal transition, but its origin has remained elusive for more than two decades. Here, the authors show that this transition results from intertwined density waves that arise from a coupling between charge and spin degrees of freedom
- Junjie Zhang
- , D. Phelan
- & J. F. Mitchell
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Article
| Open AccessMetal-organic framework and inorganic glass composites
Metal-organic frameworks constitute a family of glass formers that is distinct from those that are polymeric, metallic, or inorganic. Here the authors show that they can be combined with different inorganic aluminophosphate glasses to produce a composite with mechanical properties intermediate between the two end-members.
- Louis Longley
- , Courtney Calahoo
- & Thomas D. Bennett
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Article
| Open AccessAutonomously revealing hidden local structures in supercooled liquids
The origin of dynamical slowdown in disordered materials remains elusive, especially in the absence of obvious structural changes. Boattini et al. use unsupervised machine learning to reveal correlations between structural and dynamical heterogeneity in supercooled liquids.
- Emanuele Boattini
- , Susana Marín-Aguilar
- & Laura Filion
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| Open AccessA general-purpose machine-learning force field for bulk and nanostructured phosphorus
Atomistic simulations of phosphorus represent a challenge due to the element’s highly diverse allotropic structures. Here the authors propose a general-purpose machine-learning force field for elemental phosphorus, which can describe a broad range of relevant bulk and nanostructured allotropes.
- Volker L. Deringer
- , Miguel A. Caro
- & Gábor Csányi
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Article
| Open AccessUnderstanding high pressure molecular hydrogen with a hierarchical machine-learned potential
Hydrogen has multiple molecular phases which are challenging to explore computationally. The authors develop a machine-learning approach, learning from reference ab initio molecular dynamics simulations, to derive a transferable hierarchical force model that provides insight into high pressure phases and the melting line of H2.
- Hongxiang Zong
- , Heather Wiebe
- & Graeme J. Ackland
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Article
| Open AccessCooperatively rearranging regions change shape near the mode-coupling crossover for colloidal liquids on a sphere
The static and dynamic behavior of condensed phases residing on curved surfaces can be fundamentally different from their counterparts in Euclidean space. Singh et al. test several competing glass theories on colloidal liquids confined to the surface of a sphere and show they behave like 3D bulk liquids.
- Navneet Singh
- , A. K. Sood
- & Rajesh Ganapathy
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| Open AccessEmergent solidity of amorphous materials as a consequence of mechanical self-organisation
Glass materials are solid, like crystals, but lack long-range order, whilst the origin of their solidity remains elusive. Tong et al. show that the emergent solidity of glasses is induced by self-organization of percolation of force-bearing network appeared at the non-equilibrium glass transition upon cooling.
- Hua Tong
- , Shiladitya Sengupta
- & Hajime Tanaka
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Article
| Open AccessMachine learning identifies scale-free properties in disordered materials
The performance of a trained neural network may be biased even by generic features of its architecture. Yu et al. ask for the disordered lattice of atoms producing a certain wave localization and the network prefers to answer with power-law distributed displacements.
- Sunkyu Yu
- , Xianji Piao
- & Namkyoo Park
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| Open AccessChemical engineering of quasicrystal approximants in lanthanide-based coordination solids
Tessellation of self-assembling molecular building blocks is attractive for accessing metal-organic materials with geometric frustration, however such motifs are rare. Here the authors use ytterbium(II) as a five-vertex node to assemble an Archimedean tessellation in a bulk, molecule-based material.
- Laura Voigt
- , Mariusz Kubus
- & Kasper S. Pedersen
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| Open AccessConnecting shear localization with the long-range correlated polarized stress fields in granular materials
Understanding the behavior of jammed granular matter is important for a range of phenomena, from materials science to geology. Wang et al. uncover relations between stress correlations and emergence of localized shear bands due to external shear stress, which breaks the rotational symmetry.
- Yinqiao Wang
- , Yujie Wang
- & Jie Zhang
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| Open AccessUncovering the effects of interface-induced ordering of liquid on crystal growth using machine learning
Crystallization is a challenging process to model quantitatively. Here the authors use machine learning and atomistic simulations together to uncover the role of the liquid structure on the process of crystallization and derive a predictive kinetic model of crystal growth.
- Rodrigo Freitas
- & Evan J. Reed
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| Open AccessConnecting glass-forming ability of binary mixtures of soft particles to equilibrium melting temperatures
Glass-forming ability is an important parameter for manufacturing glassy materials, but it remains challenging to be characterized due to its nonequilibrium nature. Nie et al. provide a solution by linking it to the pressure dependence of melting temperature of constituent components in binary mixtures.
- Yunhuan Nie
- , Jun Liu
- & Ning Xu
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Article
| Open AccessPile-up transmission and reflection of topological defects at grain boundaries in colloidal crystals
The plastic flow of crystals takes place via the elementary flow of topological defects and is strongly influenced by the presence of grain boundaries. Here, the authors show how the atomic structure of grain boundaries affects the dynamics of interstitial defects driven across monolayer colloidal polycrystals.
- Xin Cao
- , Emanuele Panizon
- & Clemens Bechinger
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Article
| Open AccessAb initio phase diagram and nucleation of gallium
Exploring nucleation processes of gallium by molecular simulation is extremely challenging due to its structural complexity. Here the authors demonstrate a neural network potential trained on a multithermal–multibaric DFT data for the study of the phase diagram of gallium in a wide temperature and pressure range.
- Haiyang Niu
- , Luigi Bonati
- & Michele Parrinello
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Article
| Open AccessOxide-ion conduction in the Dion–Jacobson phase CsBi2Ti2NbO10−δ
Oxide ion conductors are an exciting class of materials with applications in various domains. Here, the authors show that Dion–Jacobson Phases are a structure supporting high O2− mobility. The bulk conductivity of CsBi2Ti2NbO10−δ even exceeds that of YSZ, offering new possibilities in electrolyte discovery.
- Wenrui Zhang
- , Kotaro Fujii
- & Masatomo Yashima
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Article
| Open AccessControlling solid-liquid interfacial energy anisotropy through the isotropic liquid
In metals, dendrite orientation during crystal growth has been hypothesized to be affected by compositional additions. Here, the authors combine molecular dynamics and experiments in the aluminium-samarium system to prove solute atoms can affect dendrite orientation via interfacial energy changes.
- Lei Wang
- , Jeffrey J. Hoyt
- & Chad W. Sinclair
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Article
| Open AccessTwo-way tuning of structural order in metallic glasses
While metallic glasses are expected to have tunable structures, these have rarely been demonstrated. Here, the authors combine temperature and pressure to show a two-way structural tuning in rare earth-based metallic glasses beyond the nearest-neighbor atomic shells.
- Hongbo Lou
- , Zhidan Zeng
- & Qiaoshi Zeng
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| Open AccessStructural order as a genuine control parameter of dynamics in simple glass formers
The glass-forming materials exhibit dynamical slowing down together with spatial heterogeneity at microscales, but their origin remains debated. Tong and Tanaka show that this phenomenon can be unified based on a structural order parameter capable of detecting subtle ordering in instantaneous liquid states.
- Hua Tong
- & Hajime Tanaka
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Article
| Open AccessA transferable machine-learning framework linking interstice distribution and plastic heterogeneity in metallic glasses
Understanding plastic deformation in metallic glasses is challenging due to their heterogeneous atomic environments. Here the authors propose a machine learning approach generalizable across compositions to predict the structural features from which plastic deformation is initiated in a metallic glass.
- Qi Wang
- & Anubhav Jain
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Article
| Open AccessFast coalescence of metallic glass nanoparticles
The coarsening of amorphous metallic nanoparticles remains poorly understood. Here, the authors combine high resolution microscopy and atomistic simulations to show the disordered structure of amorphous nanoparticles makes them coarsen faster than crystalline ones.
- Yuan Tian
- , Wei Jiao
- & Mingwei Chen
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Article
| Open AccessThe dualism between adatom- and vacancy-based single crystal growth models
In homoepitaxial crystal growth, four established modes describe atom deposition on a single crystal surface. Here the authors present a model that shows that, for each adatom growth mode, there exists an analogous but inverse version for vacancy growth. This also applies to combined growth.
- Marcel J. Rost
- , Leon Jacobse
- & Marc T. M. Koper
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Article
| Open AccessUnraveling the thermodynamic criteria for size-dependent spontaneous phase separation in soft porous crystals
Soft porous crystals hold big promise as functional nanoporous materials due to their stimuli responsive flexibility. Here, molecular dynamics simulations reveal a new type of spatial disorder in mesoscale crystals that helps to understand the size-dependency of their phase transition behavior.
- Sven M. J. Rogge
- , Michel Waroquier
- & Veronique Van Speybroeck
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Article
| Open AccessDirect imaging of structural disordering and heterogeneous dynamics of fullerene molecular liquid
Understanding the structural changes in disordered non-equilibrium materials is important for their processing, yet it remains experimentally challenging to follow the dynamics. Here, Choe et al. image the first-order like transition from crystal to liquid in a model molecular system adsorbed on graphene by tracking individual molecules in real time.
- Jeongheon Choe
- , Yangjin Lee
- & Kwanpyo Kim
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Article
| Open AccessMetallic-mean quasicrystals as aperiodic approximants of periodic crystals
Quasicrystals differ from traditional incommensurate structures because they have non-crystallographic rotational symmetries. Here the authors introduce a scheme to produce metallic-mean quasicrystals in two dimensions with 6-fold rotational symmetry that can be seen as approximant to periodic tilings.
- Joichiro Nakakura
- , Primož Ziherl
- & Tomonari Dotera
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Article
| Open AccessArtificial colloidal liquid metacrystals by shearing microlithography
Stable periodic structures can be difficult to obtain in a liquid crystal compared to a solid due to the energetic instability of the former. Here the authors present a technique to fabricate quasicrystalline structures of graphene oxide liquid crystals which have high stability.
- Yanqiu Jiang
- , Fan Guo
- & Chao Gao
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Article
| Open AccessLocal orbital degeneracy lifting as a precursor to an orbital-selective Peierls transition
A common feature of many transition metal materials is global symmetry breaking at low temperatures. Here the authors show that such materials are characterized by fluctuating symmetry-lowering distortions that exist pre-formed in higher temperature phases with greater average symmetry.
- E. S. Bozin
- , W. G. Yin
- & S. J. L. Billinge
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Article
| Open AccessDirect observation and impact of co-segregated atoms in magnesium having multiple alloying elements
Commercial alloys contain trace solutes that segregate at grain boundaries but have been difficult to directly image due to electron beam damage. Here, the authors use atomic-resolution energy dispersive X-ray spectroscopy at lower electron voltage to image segregation at magnesium alloy twin boundaries.
- Xiaojun Zhao
- , Houwen Chen
- & Jian-Feng Nie
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| Open AccessDendrite fragmentation induced by massive-like δ–γ transformation in Fe–C alloys
Transitioning from columnar to equiaxed grains is paramount for desired microstructures during steel casting. Here, the authors report a new fragmentation mechanism based on a phase transition at grain boundaries that can contribute to equiaxed grains.
- Hideyuki Yasuda
- , Kohei Morishita
- & Akihisa Takeuchi
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Article
| Open AccessEmergent symmetries in block copolymer epitaxy
The directed self-assembly (DSA) of block copolymers (BCPs) has shown great promise in fabricating customized two-dimensional (2D) geometries at the nano- and mesoscale. Here, the authors report the discovery of spontaneous symmetry breaking and superlattice formation in DSA of BCP.
- Yi Ding
- , Karim R. Gadelrab
- & Alfredo Alexander-Katz
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Article
| Open AccessLow viscosity of the Earth’s inner core
The inner core of the Earth is formed of a crystalline solid which is mostly composed of iron. Here, the authors use molecular dynamics methods to show that the crystalline structure of the inner core may have a viscosity close to that of liquid iron, despite being a solid.
- Anatoly B. Belonoshko
- , Jie Fu
- & Maurizio Mattesini
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| Open AccessMulti-level chirality in liquid crystals formed by achiral molecules
It was previously shown that chiral structures can be formed from achiral bent-shaped mesogens. Here the authors observe hierarchical chiral structures with coupling of chirality at different levels in a system with achiral constituents.
- Mirosław Salamończyk
- , Nataša Vaupotič
- & Ewa Gorecka
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Article
| Open AccessDynamic emission Stokes shift and liquid-like dielectric solvation of band edge carriers in lead-halide perovskites
Lead halide perovskites have unique electronic properties that depend on the crystal’s anharmonicity. Dielectric solvation theories, developed for molecules dissolved in polar liquids, are shown here to reproduce the temperature behavior of carrier solvation in the electronic spectra, implying strongly anharmonic lattice dynamics.
- Yinsheng Guo
- , Omer Yaffe
- & Louis E. Brus
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Article
| Open AccessAtomic electrostatic maps of 1D channels in 2D semiconductors using 4D scanning transmission electron microscopy
Imaging electrostatic field around individual atoms or defective areas in monolayer 2D materials is crucial to understand their structural coordination. Here, the authors report local changes in specific atomic bonds and provide in-depth structural information of complex defective monolayer MoS2 and WS2 systems by 4D STEM.
- Shiang Fang
- , Yi Wen
- & Jamie H. Warner
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Article
| Open AccessBand gap closure, incommensurability and molecular dissociation of dense chlorine
Molecular systems are predicted to transform into atomic solids and be metallic at high pressure; this was observed for the diatomic elements iodine and bromine. Here the authors access the higher pressures needed to observe the dissociation in chlorine, through an incommensurate phase, and provide evidence for metallization.
- Philip Dalladay-Simpson
- , Jack Binns
- & Ross T. Howie
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Article
| Open AccessAtomic insight into hydration shells around facetted nanoparticles
Experimental structural insight into hydration shells around nanoparticles is challenging. Here the authors use X-ray scattering and pair distribution function analysis to reveal interatomic distances in the very first adsorbed water layer as well as extended restructured layers out to 15 Å, with a bulk-like signature.
- Sabrina L. J. Thomä
- , Sebastian W. Krauss
- & Mirijam Zobel
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Article
| Open AccessSupercluster-coupled crystal growth in metallic glass forming liquids
Conventional crystal growth models assume crystals grow into a structure-less liquid, even though liquid metals have shown evidence of structural ordering. Here, the authors show crystal growth can be influenced by the presence of thermodynamically unstable local structural order in the liquid.
- Yujun Xie
- , Sungwoo Sohn
- & Judy J. Cha
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Article
| Open AccessRole of defects in determining the magnetic ground state of ytterbium titanate
Exploring the role of structural defect is essential to understand the exotic quantum spin phenoma in rare earth pyrochlores. Here the authors show oxygen vacancies can stabilise the spin liquid phase and reveal the ferromagnetic ground state when oxygen vacancies are eliminated in Yb2Ti2O7.
- D. F. Bowman
- , E. Cemal
- & J. P. Goff
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Article
| Open AccessAltered chemistry of oxygen and iron under deep Earth conditions
Iron oxides prevail in the deep Earth, at extreme pressures and temperatures, with different stoichiometries than in ambient conditions. Here, high-pressure synchrotron X-ray spectroscopic measurements reveal the oxidation states of Fe and O in iron superoxide, shedding light on the puzzling chemistry of iron and oxygen in the deep Earth
- Jin Liu
- , Qingyang Hu
- & Wendy L. Mao
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Article
| Open AccessLow-frequency vibrational modes of stable glasses
The nature of the vibrational modes of amorphous solids is of fundamental interest, but assessing them is challenging due to very long equilibrium times involved. Wang et al. numerically model the localized low-frequency vibrational modes in glasses and show the sensitivity of their populations to glass stability.
- Lijin Wang
- , Andrea Ninarello
- & Elijah Flenner
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Article
| Open AccessPressure-driven phase transitions and reduction of dimensionality in 2D silicon nanosheets
Silicon nanostructures have important applications as functional materials. Here the authors investigate the structural transformations of 2D silicon nanosheets under compression and decompression, showing the irreversible formation of 1D silicon nanowires.
- Gil Chan Hwang
- , Douglas A. Blom
- & Yongjae Lee