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| Open AccessMacroscopic self-reorientation of interacting two-dimensional crystals
Precise control of the relative orientation of two two-dimensional layers enables reproducible fabrication of heterostructure devices. Here, the authors show that graphene rotates towards the crystallographic direction of a boron-nitride substrate due to the interplay between van der Waals and elastic energies.
- C. R. Woods
- , F. Withers
- & K. S. Novoselov
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| Open AccessStable topological insulators achieved using high energy electron beams
Defects in solids may introduce additional charges that influence the overall charge transport behaviour. Here, Zhao et al. use swift electron beams to compensate charge defects, which effectively tune Bi2Te3 and Bi2Se3 from p-type to n-type while preserving their topological properties.
- Lukas Zhao
- , Marcin Konczykowski
- & Lia Krusin-Elbaum
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| Open AccessSpatial control of chemical processes on nanostructures through nano-localized water heating
It is generally believed that rapid dissipation means that spatially precise heating is not feasible via thermoplasmonic means. Here, the authors induce highly localized heating around plasmonic nanostructures by pulsed laser irradiation, which effects chemical modification of surface bound molecules.
- Calum Jack
- , Affar S. Karimullah
- & Malcolm Kadodwala
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Article
| Open AccessA metallic mosaic phase and the origin of Mott-insulating state in 1T-TaS2
In correlated materials, new phases emerge when the balance between many-body interactions is perturbed. Here, Ma et al. induce a mosaic charge-density-wave phase out of Mott insulating state in layered 1T-TaS2by voltage pulses, which reveals a dominating role of interlayer stacking order.
- Liguo Ma
- , Cun Ye
- & Yuanbo Zhang
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Article
| Open AccessMobility overestimation due to gated contacts in organic field-effect transistors
Charge mobility, extracted from current–voltage curves, is an important parameter for evaluating the performance of organic field-effect transistors. Bittle et al. show that charge mobility can be overestimated by one order of magnitude due to the gate bias dependence of the charge injection process.
- Emily G. Bittle
- , James I. Basham
- & David J. Gundlach
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| Open AccessDisorder-mediated crowd control in an active matter system
Many living systems, such as bacterial colonies, exhibit collective and dynamic behaviours that are sensitive to the change in environmental conditions. Here, the authors show that a colloidal active matter system switches between gathering and dispersal of individuals in response to a disordered potential.
- Erçağ Pinçe
- , Sabareesh K. P. Velu
- & Giorgio Volpe
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Article
| Open AccessTracking the shape-dependent sintering of platinum–rhodium model catalysts under operando conditions
Understanding nanoparticle sintering is crucial for designing stable catalysts. Here, the authors use high energy grazing incidence X-ray diffraction as an in situprobe to track the compositiondependent three-dimensional restructuring of supported alloy nanoparticles during carbon monoxide oxidation.
- Uta Hejral
- , Patrick Müller
- & Andreas Stierle
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Article
| Open AccessDrift transport of helical spin coherence with tailored spin–orbit interactions
Spin-orbit effects in non-magnetic semiconductors allow for the manipulation of electronic spins in the absence of an applied magnetic field. Here, the authors exploit a persistent spin helix state in single quantum wells to enhance the coherence length of electronic drift transport.
- Y. Kunihashi
- , H. Sanada
- & T. Sogawa
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| Open AccessTuning selectivity of electrochemical reactions by atomically dispersed platinum catalyst
Atomically dispersed metal catalysts display high atom efficiency for electrocatalytic processes. Here, the authors report that sulfur-doped zeolite-templated carbon stabilizes highly dispersed platinum species, predominantly as single-atom centres, and probe its oxygen reduction selectivity.
- Chang Hyuck Choi
- , Minho Kim
- & Minkee Choi
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Article
| Open AccessElectrochemical oxygen reduction catalysed by Ni3(hexaiminotriphenylene)2
There are numerous heterogeneous oxygen reduction reaction catalysts, although synthetic tunability is rare among these materials. Here, the authors report that a conductive metal-organic framework functions as a well-defined, tunable electrocatalyst for the oxygen reduction reaction in alkaline solution.
- Elise M. Miner
- , Tomohiro Fukushima
- & Mircea Dincă
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Article
| Open AccessAnomalous correlation effects and unique phase diagram of electron-doped FeSe revealed by photoemission spectroscopy
Electron doping is a powerful way to induce quantum phase transitions in materials and explore exotic states of matter. Here, Wen et al. present carefully-controlled potassium dosing in FeSe films and FeSe0.93S0.07bulk, which enhances superconductivity and induces other anomalous phases, revealing a complex phase diagram.
- C. H. P. Wen
- , H. C. Xu
- & D. L. Feng
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Article
| Open AccessSelectively enhanced photocurrent generation in twisted bilayer graphene with van Hove singularity
Graphene has the high carrier mobility and short photoresponse time required for efficient photodetection, but broad and weak optical absorption are severe drawbacks. Here, the authors show that twisted bilayer graphene with van Hove singularities exhibits a strong light-matter interaction and selectively enhanced photocurrent generation.
- Jianbo Yin
- , Huan Wang
- & Zhongfan Liu
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Article
| Open AccessLarge-area graphene-based nanofiltration membranes by shear alignment of discotic nematic liquid crystals of graphene oxide
Membranes made from graphene have ultra-fast water transport and precise molecular sieving properties. Here, the authors show how large-area membranes can be manufactured by a rapid and scalable process based on shear alignment of graphene-oxide liquid crystals for unlocking industrial applications.
- Abozar Akbari
- , Phillip Sheath
- & Mainak Majumder
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| Open AccessDesigning high-performance layered thermoelectric materials through orbital engineering
Thermoelectric materials with enhanced performances need to be identified. Here, the authors use the crystal field splitting energy of orbitals as a descriptor to design thermoelectric materials by solid solution maps and strain engineering in layered CaAl2Si2-type Zintl compounds.
- Jiawei Zhang
- , Lirong Song
- & Bo B. Iversen
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Article
| Open AccessLasing in silicon–organic hybrid waveguides
On-chip light sources for silicon photonic circuits remain a challenge since the indirect bandgap of silicon prevents efficient light emission. The authors demonstrate that lasing can be achieved by combining standard silicon-on-insulator waveguides with dye-doped organic cladding materials to provide optical gain.
- Dietmar Korn
- , Matthias Lauermann
- & Christian Koos
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| Open AccessHigh-performance thermoelectric nanocomposites from nanocrystal building blocks
Nanomaterials provide a route to efficient solid-state conversion between thermal and electrical energy. Here, the authors demonstrate that a combination of metal and semiconductor colloidal nanocrystals can produce thermoelectric nanocomposites with high performance.
- Maria Ibáñez
- , Zhishan Luo
- & Andreu Cabot
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Article
| Open AccessField-free magnetization reversal by spin-Hall effect and exchange bias
Future information storage technology may exploit electrical currents to write the states of ferromagnetic nanoelements via spin torque effects. Here, the authors demonstrate such behaviour promoted by exchange bias from an interfaced antiferromagnet, which may help overcome practical device limitations.
- A. van den Brink
- , G. Vermijs
- & B. Koopmans
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| Open AccessCommensurate antiferromagnetic excitations as a signature of the pseudogap in the tetragonal high-Tc cuprate HgBa2CuO4+δ
In the cuprates, antiferromagnetic correlations might be the cause of the pseudogap phenomenon. Here the authors use neutron scattering on the tetragonal cuprate HgBa2CuO4+δrevealing commensurate antiferromagnetic excitations as a signature of the pseudogap state.
- M. K. Chan
- , C. J. Dorow
- & M. Greven
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| Open AccessElemental superdoping of graphene and carbon nanotubes
Doping of low-dimensional graphitic materials with heteroatoms can enhance their catalytic, electrochemical and magnetic properties. Here, the authors report a tunable method to ‘superdope’ these materials with high levels of nitrogen, sulfur, or boron, via a simple fluorination and annealing procedure.
- Yuan Liu
- , Yuting Shen
- & Youwei Du
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| Open AccessObservation of magnon-mediated current drag in Pt/yttrium iron garnet/Pt(Ta) trilayers
Future spintronic devices may be based on the transport of electronic spin without an associated charge current in thin film materials. Here, the authors demonstrate the interconversion of spin current at the interface between a normal metal and magnetic insulator via magnon-mediated current drag.
- Junxue Li
- , Yadong Xu
- & Jing Shi
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| Open AccessSpin generation via bulk spin current in three-dimensional topological insulators
Future spintronic devices may exploit topological insulators, bulk-insulating materials possessing conductive surface states with orthogonally-locked electronic spin and momentum. Here, the authors propose a mechanism by which bulk spin currents drive surface spin accumulation in such a material.
- Xingyue Peng
- , Yiming Yang
- & Dong Yu
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| Open AccessTopological phase transitions and chiral inelastic transport induced by the squeezing of light
Most known topological states of light are in the end closely analogous to fermionic states. Here, the authors show that the squeezing of light can lead to the formation of photonic topological states which do not have any fermionic counterpart yet support unusual chiral edge states.
- Vittorio Peano
- , Martin Houde
- & Aashish A. Clerk
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| Open AccessObservation of a three-dimensional quasi-long-range electronic supermodulation in YBa2Cu3O7−x/La0.7Ca0.3MnO3 heterostructures
Understanding the nature of competing phases is a key to understanding the superconducting mechanism of unconventional superconductors. Here, the authors demonstrate a three-dimensional charge ordering state which competes with superconductivity in epitaxial YBa2Cu3O7-x thin films grown on La0.7Ca0.3MnO3substrates.
- Junfeng He
- , Padraic Shafer
- & Rui-Hua He
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| Open AccessSpin-momentum coupled Bose-Einstein condensates with lattice band pseudospins
The optical trapping of ultracold atoms allows for the simulation and controlled exploration of phenomena normally found in condensed matter systems. Here, the authors demonstrate spin–orbit coupling between lattice band pseudospins in a Bose-Einstein condensate of ultracold atoms.
- M. A. Khamehchi
- , Chunlei Qu
- & P. Engels
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| Open AccessEfficient linear phase contrast in scanning transmission electron microscopy with matched illumination and detector interferometry
Scanning transmission electron microscopy is a powerful material probe, but constrained to large atomic number samples due to the issues of beam damage and weak scattering. Here, Ophus et al.propose a method that produces linear phase contrast in a focused electron beam to image dose-sensitive objects.
- Colin Ophus
- , Jim Ciston
- & Peter Ercius
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| Open AccessLarge elasto-optic effect and reversible electrochromism in multiferroic BiFeO3
Modern technology such as electronics and photovoltaics requires careful control of optical responses of electronic properties. Here, Sando et al. demonstrate a large variation of optical index and light absorption in multiferroic material BiFeO3thin films, tunable by in-film strain or electric field.
- D. Sando
- , Yurong Yang
- & M. Bibes
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| Open AccessLayer-dependent quantum cooperation of electron and hole states in the anomalous semimetal WTe2
Tungsten ditelluride is a semi-metallic two-dimensional material that has exhibited large magnetoresistance. Here, the authors use angle- and spin-resolved photoemission spectroscopy to investigate the band structure of this transition metal dichalcogenide and identify layer-dependent electronic behaviour.
- Pranab Kumar Das
- , D. Di Sante
- & R. J. Cava
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| Open AccessFlexible single-layer ionic organic–inorganic frameworks towards precise nano-size separation
Membranes composed of ionic frameworks offer applications in nano-size separation thanks to their highly regular pores. Here, the authors devise such a system composed of polyoxometalates and organic pseudorotaxanes, and demonstrate their ability to separate mixed sized CdTe quantum dots.
- Liang Yue
- , Shan Wang
- & Lixin Wu
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| Open AccessNear-field photocurrent nanoscopy on bare and encapsulated graphene
Graphene grain boundaries and charge inhomogeneities limit its electronic properties. Here the authors combine scanning near-field optical microscopy with electrical read-out to image these defects at the nanoscale under an encapsulation layer, and show that charges build up along the edges of the flake.
- Achim Woessner
- , Pablo Alonso-González
- & Frank H. L. Koppens
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Article
| Open AccessMicro-total envelope system with silicon nanowire separator for safe carcinogenic chemistry
Carcinogenic compounds present difficulties in synthesis not just during reaction but perhaps especially during purification. Here, the authors report a microfluidic device for the use of carcinogenic chloromethyl methyl ether that includes a silicon nanowire separator allowing isolated, automated purification.
- Ajay K. Singh
- , Dong-Hyeon Ko
- & Dong-Pyo Kim
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| Open AccessEnhanced spin–orbit torques by oxygen incorporation in tungsten films
When interfaced with a current-carrying heavy metal, spin orbit effects can generate a torque on the magnetization of a ferromagnet, understood as a bulk effect. Here, the authors show evidence of an interfacial contribution to such spin orbit torque in O-doped W/CoFeB thin film systems.
- Kai-Uwe Demasius
- , Timothy Phung
- & Stuart S. P. Parkin
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Article
| Open AccessDirectional charge separation in isolated organic semiconductor crystalline nanowires
Photo-induced charge separation in organic semiconductors usually occurs at interfaces between electron donors and acceptors. Here, the authors show using photoluminescence measurements that charge separation is intrinsic and directional in organic crystalline nanowires made of stacked monomers.
- J. A. Labastide
- , H. B. Thompson
- & M. D. Barnes
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| Open AccessMagnon spectrum of the helimagnetic insulator Cu2OSeO3
Cu2OSeO3 possesses a helical spin structure which supports a rich phase diagram of magnetic states, including a lattice of particle-like skyrmions. Here, the authors use inelastic neutron scattering to elucidate the three-dimensional magnon spectrum and underlying spin Hamiltonian of Cu2OSeO3.
- P. Y. Portnichenko
- , J. Romhányi
- & D. S. Inosov
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| Open Access1s-intraexcitonic dynamics in monolayer MoS2 probed by ultrafast mid-infrared spectroscopy
Excitons—bound electron-hole pairs—in two-dimensional transition-metal dichalcogenides can exhibit a rich spectrum of excited states. Here, the authors use ultrafast mid-infrared spectroscopy to explore the dynamics of these so-called 1s-intraexcitonic transitions in monolayer molybdenum disulphide.
- Soonyoung Cha
- , Ji Ho Sung
- & Hyunyong Choi
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Article
| Open AccessPhotoresponse of supramolecular self-assembled networks on graphene–diamond interfaces
Two-dimensional, self-assembled heteromolecular networks often lack functionality. Here the authors study the photoresponse of self-assembled heteromolecular networks, while controlling their positions and interfaces at an atomic level, suggesting bottom-up assembly of optoelectronics devices.
- Sarah Wieghold
- , Juan Li
- & Carlos-Andres Palma
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| Open AccessSignatures of the Adler–Bell–Jackiw chiral anomaly in a Weyl fermion semimetal
Anomalous conducting behavior of solids may reflect the presence of novel quantum states. Here, Zhang et al. report an increased conductivity in TaAs with a magnetic field applied along the direction of the current, which reveals an inherent property of the Weyl Fermion.
- Cheng-Long Zhang
- , Su-Yang Xu
- & Shuang Jia
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| Open AccessControl of antiferromagnetic domain distribution via polarization-dependent optical annealing
The control of magnetic domains in antiferromagnets is limited by the lack of a net magnetic moment which may be manipulated by external stimuli. Here, the authors present an optical method for switching such domain states in MnF2based on azimuth-dependent absorption of linearly polarized light.
- Takuya Higuchi
- & Makoto Kuwata-Gonokami
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Article
| Open AccessIn situ stress observation in oxide films and how tensile stress influences oxygen ion conduction
Strain engineering is used to tune physiochemical material properties, but detailed insights of how the crystal growth affects the stress are yet lacking. Here, the authors analyse in situ simultaneously the induced stress and growth mode during the epitaxial growth of an oxygen ion conductor.
- Aline Fluri
- , Daniele Pergolesi
- & Thomas Lippert
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| Open AccessSuper-crystals in composite ferroelectrics
Crystalline materials are formed by the periodic order of atomic unit cells. Here, Pierangeli et al. report the formation of a ferrelectric super-crystal with micrometric unit cell from modulated nanoscale disorder in potassium-lithium-tantalate-niobate, which is potentially useful for engineering ordered states out of disorder.
- D. Pierangeli
- , M. Ferraro
- & E. DelRe
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Article
| Open AccessOrbital two-channel Kondo effect in epitaxial ferromagnetic L10-MnAl films
In metals, electronic scattering from defects by the two-channel Kondo effect is expected to cause deviation from standard low temperature behaviour, however this effect has not been unambiguously shown. Here, the authors present evidence consistent with all transport signatures of the effect in ferromagnetic L10-MnAl films.
- L. J. Zhu
- , S. H. Nie
- & J. H. Zhao
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Article
| Open AccessFerroelasticity and domain physics in two-dimensional transition metal dichalcogenide monolayers
The atoms in two-dimensional transition-metal dichalcogenides can arrange into a number of different structures, or polymorphs. Here, the authors use first-principles calculations to show that one such polymorph, 1T', can exhibit a large mechanical response to external applied strain.
- Wenbin Li
- & Ju Li
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Article
| Open AccessMultiscale deformations lead to high toughness and circularly polarized emission in helical nacre-like fibres
The mechanical properties and hierarchical structure of nacre have been widely investigated as a biomimetic template for applications. Here, the authors demonstrate that nacre-like fibres made from nanoplatelets and polymers show exceptional stretchability and toughness.
- Jia Zhang
- , Wenchun Feng
- & Nicholas A. Kotov
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Article
| Open AccessLocalized soft elasticity in liquid crystal elastomers
Ruggedized stretchable electronic devices motivate the development of globally stretchable yet locally stiff materials. Here, Ware et al. programme the self-organization of liquid crystal elastomers to yield stretchable materials of homogenous composition but with spatial variation in mechanical properties.
- Taylor H. Ware
- , John S. Biggins
- & Timothy J. White
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Article
| Open AccessGraphene oxide/metal nanocrystal multilaminates as the atomic limit for safe and selective hydrogen storage
Hydrogen fuel cell electric vehicles are poised to transform the automotive industry, but the lack of safe, high density solid state hydrogen storage solutions is stifling progress. Here, the authors develop a graphene oxide/magnesium nanocomposite which appears to overcome many of the existing challenges.
- Eun Seon Cho
- , Anne M. Ruminski
- & Jeffrey J. Urban
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Article
| Open AccessAharonov–Bohm oscillations in Dirac semimetal Cd3As2 nanowires
Dirac semimetals are a three-dimensional analogue of graphene that can support massless Dirac fermions in their bulk and Fermi-arc surface states. Here, the authors observe Aharonov–Bohm oscillations in transport measurements on Cd3As2nanowires, revealing these exotic surface states.
- Li-Xian Wang
- , Cai-Zhen Li
- & Zhi-Min Liao
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Article
| Open AccessSwitchable friction enabled by nanoscale self-assembly on graphene
Graphene can exhibit pronounced frictional anisotropy, which was thought to arise because of nanoscale ripples. Here, the authors provide evidence that this effect could instead be a result of adsorbates that self-assemble into a highly regular superlattice of stripes with a period of four to six nanometres.
- Patrick Gallagher
- , Menyoung Lee
- & David Goldhaber-Gordon
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Article
| Open AccessTailoring the chiral magnetic interaction between two individual atoms
The Dzyaloshinskii-Moriya exchange interaction arises in magnetic systems with broken inversion symmetry and promotes chiral magnetic order which may be exploited in spintronic devices. Here, the authors demonstrate how such an interaction between magnetic atoms on a metallic surface may be tuned by their separation.
- A. A. Khajetoorians
- , M. Steinbrecher
- & R. Wiesendanger
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Article
| Open AccessReducing dynamic disorder in small-molecule organic semiconductors by suppressing large-amplitude thermal motions
Thermal vibration is harmful to charge transport in molecular semiconductors, which hinders the use of these materials in flexible electronics. Here, Illig et al.show that the vibration is suppressed when molecular side chains are attached to the long axis of conjugated cores.
- Steffen Illig
- , Alexander S. Eggeman
- & Henning Sirringhaus
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Article
| Open AccessUnfolding the physics of URu2Si2 through silicon to phosphorus substitution
The heavy fermion compound URu2Si2displays a hidden order phase and superconductivity at low temperatures. Here, the authors perform substitution studies—partially replacing silicon with phosphorus—and study the effects on hidden order and superconductivity.
- A. Gallagher
- , K.-W. Chen
- & R. E. Baumbach