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| Open AccessNeutron scattering and neural-network quantum molecular dynamics investigation of the vibrations of ammonia along the solid-to-liquid transition
Through neutron scattering experiments coupled with machine learning, the authors uncover the strong role of nuclear quantum effects in the dynamics of ammonia in both its solid and technologically relevant liquid phase.
- T. M. Linker
- , A. Krishnamoorthy
- & P. D. Vashishta
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Article
| Open AccessEvidence for a finite-momentum Cooper pair in tricolor d-wave superconducting superlattices
The authors study a YbCoIn5/CeCoIn5/YbRhIn5 heterostructure. Using non-reciprocity in the second harmonic transport response, they demonstrate the existence of a specific form of finite-momentum pairing called a helical superconducting state, where the phase of the order parameter is spontaneously spatially modulated.
- T. Asaba
- , M. Naritsuka
- & Y. Matsuda
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Article
| Open AccessObservation of interlayer plasmon polaron in graphene/WS2 heterostructures
Here, the authors report the observation of an interlayer plasmon polaron in heterostructures composed of graphene and monolayer WS2. This is manifested in the ARPES spectra as a strong quasiparticle peak accompanied by several carrier density-dependent shake-off replicas around the WS2 conduction band minimum.
- Søren Ulstrup
- , Yann in ’t Veld
- & Jyoti Katoch
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Article
| Open AccessVisualizing the gas-sensitive structure of the CuZn surface in methanol synthesis catalysis
Industrial methanol synthesis uses materials based on Cu and ZnO. We present high-resolution imaging of active surfaces which reveals how Zn species are transported at the active Cu interface in diffusion processes controlled by the reactant gas composition.
- Sigmund Jensen
- , Mathias H. R. Mammen
- & Jeppe V. Lauritsen
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Article
| Open AccessRevealing the three-dimensional arrangement of polar topology in nanoparticles
Low-dimensional ferroelectric systems are predicted to have topologically nontrivial polar structures, such as vortices or skyrmions. Here authors present atomic-scale 3D topological polar structures in BaTiO3 nanoparticles using atomic electron tomography and revealed their size-dependent transitions.
- Chaehwa Jeong
- , Juhyeok Lee
- & Yongsoo Yang
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| Open AccessSpin disorder control of topological spin texture
Stabilizing non-trivial magnetic spin textures at room temperature remains challenging. Here, the authors propose introducing magnetic atoms into the van der Waals gap of 2D magnets Fe3GaTe2 to stabilize the magnetic spin textures beyond skyrmion.
- Hongrui Zhang
- , Yu-Tsun Shao
- & Ramamoorthy Ramesh
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| Open AccessQuantum fluctuations lead to glassy electron dynamics in the good metal regime of electron doped KTaO3
An electron glass state usually occurs in disordered insulating systems. Here the authors report evidence of glassy dynamics of conduction electrons in an electron-doped quantum paraelectric material KTaO3, in the good metal regime, where quantum fluctuations play an important role.
- Shashank Kumar Ojha
- , Sankalpa Hazra
- & Srimanta Middey
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Article
| Open AccessFree-standing ultrathin silicon wafers and solar cells through edges reinforcement
Lightweight and flexible thin crystalline silicon solar cells have huge market potential but remain relatively unexplored. Here, authors present a thin silicon structure with reinforced ring to prepare free-standing 4.7-μm 4-inch silicon wafers, achieving efficiency of 20.33% for 28-μm solar cells.
- Taojian Wu
- , Zhaolang Liu
- & Wenzhong Shen
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Article
| Open AccessAtomic-level polarization reversal in sliding ferroelectric semiconductors
Polarization reversal dynamics in sliding ferroelectrics is important for the application in slidetronics. Here, the authors observe the interlayer directional sliding induced polarization switching with simultaneous hysteresis response in γ-InSe:Y.
- Fengrui Sui
- , Haoyang Li
- & Chungang Duan
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Article
| Open AccessTopologically trivial gap-filling in superconducting Fe(Se,Te) by one-dimensional defects
Previous measurements of FeSe0.45Te0.55 found one-dimensional (1D) defects that were interpretated as domain walls hosting propagating Majorana topological modes. Here, the authors reveal that these 1D defects correspond to sub-surface debris and show that the filling of the superconducting gap on these defects is topologically trivial.
- A. Mesaros
- , G. D. Gu
- & F. Massee
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Article
| Open AccessRevealing the spatial nature of sublattice symmetry
Sublattice symmetry has long been synonymous with chiral symmetry when it comes to topological classification. Here, the authors challenge this notion by systematically investigating sublattice symmetry and revealing its spatial nature with a precise description in terms of symmetry algebra and representation.
- Rong Xiao
- & Y. X. Zhao
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Article
| Open AccessBose-Einstein condensation of non-ground-state caesium atoms
Bose-Einstein condensates (BEC) of ultracold atoms serve as low-entropy sources for a multitude of quantum-science applications. Here, the authors realize a non-ground-state caesium BEC with tunable interactions and tunable loss, opening up new possibilities for polaron and impurity physics.
- Milena Horvath
- , Sudipta Dhar
- & Hanns-Christoph Nägerl
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Article
| Open AccessObservation of dichotomic field-tunable electronic structure in twisted monolayer-bilayer graphene
The phase diagram of twisted monolayer-bilayer graphene depends on the electric field direction, exhibiting phases similar to twisted bilayer and double-bilayer graphene. Here the authors study the field dependent electronic structure, in particular flat bands, using nano-ARPES and explain the field-tunability.
- Hongyun Zhang
- , Qian Li
- & Shuyun Zhou
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Article
| Open AccessWeyl spin-momentum locking in a chiral topological semimetal
Spin-momentum locking is a fundamental property of condensed matter systems. Here, the authors evidence parallel Weyl spin-momentum locking of multifold fermions in the chiral topological semimetal PtGa.
- Jonas A. Krieger
- , Samuel Stolz
- & Niels B. M. Schröter
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Article
| Open AccessUniversal scaling law for chiral antiferromagnetism
Chiral antiferromagnets, such as Mn3Pt, host a variety of transport phenomena arising due to the chiral arrangement of the spins. Herein, the authors find two contributions to the anomalous hall effect in Mn3Pt, and through comparison with other chiral antiferromagnets develop a universal scaling law for the anomalous hall effect in chiral antiferromagnets.
- Shijie Xu
- , Bingqian Dai
- & Weisheng Zhao
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Article
| Open AccessCharge density waves tuned by biaxial tensile stress
Previous studies of the effects of strain on charge density waves have mostly focused on uniaxial strain. Here the authors use a biaxial-strain device to demonstrate switching of the charge density wave orientation, as well as a strong linear increase of the transition temperature while the gap seems to saturate.
- A. Gallo–Frantz
- , V. L. R. Jacques
- & D. Le Bolloc’h
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Article
| Open AccessSolving conformal defects in 3D conformal field theory using fuzzy sphere regularization
The study of defects and boundaries in the context of conformal field theory is important but challenging in dimensions higher than two. Here the authors use the recently developed fuzzy sphere regularization approach to perform non-perturbative analysis of defect conformal field theory in 3D
- Liangdong Hu
- , Yin-Chen He
- & W. Zhu
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Article
| Open AccessPhotonic time-crystalline behaviour mediated by phonon squeezing in Ta2NiSe5
Photonic time crystal refers to a material whose dielectric properties oscillate in time. Here the authors theoretically show such behaviour in the excitonic insulator candidate Ta2NiSe5 under optical excitation and use it to explain the enhanced THz reflectivity recently observed in pump-probe experiments
- Marios H. Michael
- , Sheikh Rubaiat Ul Haque
- & Eugene Demler
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Article
| Open AccessCurrent-sensitive Hall effect in a chiral-orbital-current state
In most materials, the hall conductivity has a scaling to the longitudinal resistance that varies between linear and quadratic. Here, Zhang et al demonstrate a hall conductivity proportional to the fifth power of the longitudinal conductivity in Mn3Si2Te6, which they attribute to enhanced force on charge carriers due to chiral orbital currents.
- Yu Zhang
- , Yifei Ni
- & Gang Cao
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| Open AccessThree-dimensional domain identification in a single hexagonal manganite nanocrystal
The authors present a 3D determination of the ferroelectric domain structure in a hexagonal yttrium manganite nanocrystal using multi-peak Bragg coherent x-ray diffraction imaging and reconstructing the full displacement field and strain tensor
- Ahmed H. Mokhtar
- , David Serban
- & Marcus C. Newton
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Article
| Open AccessRevealing hidden spin polarization in centrosymmetric van der Waals materials on ultrafast timescales
A major challenge for spin-based information technologies is the generation of spin polarization in otherwise nonmagnetic materials. Here, Arnoldi et al. demonstrate how ultrafast laser excitations can be used to generate spin polarization in a fullerene/tungsten diselenide heterostructure.
- B. Arnoldi
- , S. L. Zachritz
- & B. Stadtmüller
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Article
| Open AccessLocal gate control of Mott metal-insulator transition in a 2D metal-organic framework
The electronic correlation-driven Mott metal-insulator transition has been predicted in a 2D metal-organic framework with a kagome structure. Here the authors synthesize such a system in experiment and demonstrate an electrostatically controlled Mott transition.
- Benjamin Lowe
- , Bernard Field
- & Agustin Schiffrin
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Article
| Open AccessHigh-entropy engineering of the crystal and electronic structures in a Dirac material
Manipulating the electronic properties of topological semimetals is a central goal of modern condensed matter physics research. Here, the authors demonstrate how a high-entropy engineering approach allows for the tuning of the crystal structure and the electronic states in a Dirac semimetal.
- Antu Laha
- , Suguru Yoshida
- & Zhiqiang Mao
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Article
| Open AccessVisualizing a single wavefront dislocation induced by orbital angular momentum in graphene
Phase singularities are intimately related to orbital angular momentum. Direct local imaging of orbital angular momentum effects at the nanoscale remains challenging. Here, the authors demonstrate via scanning tunnelling microscopy that inter-orbital angular momentum scatterings induced by asymmetric potentials can modulate the phase singularities and induce single-wavefront dislocations.
- Yi-Wen Liu
- , Yu-Chen Zhuang
- & Lin He
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| Open AccessA substitutional quantum defect in WS2 discovered by high-throughput computational screening and fabricated by site-selective STM manipulation
Point defects in 2D semiconductors have potential for quantum computing applications, but their controlled design and synthesis remains challenging. Here, the authors identify and fabricate a promising quantum defect in 2D WS2 via high-throughput computational screening and scanning tunnelling microscopy.
- John C. Thomas
- , Wei Chen
- & Geoffroy Hautier
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Article
| Open AccessCollapse of carbon nanotubes due to local high-pressure from van der Waals encapsulation
vdW assembly of low-dimensional materials has proven the capability of creating structures with on-demand properties. Here, the authors report on the structural collapse of CNTs in conjunction with a metal-semiconductor junction induced by the VdW encapsulation.
- Cheng Hu
- , Jiajun Chen
- & Zhiwen Shi
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Article
| Open AccessQuantum annealing of a frustrated magnet
Quantum annealing is usually discussed as a means of finding an optimal solution for a problem where there are many local minima, such as the travelling salesman. Here, Zhao et al present an intriguing example of quantum annealing in the case of the frustrated magnet α-CoV2O6, where a transverse magnetic field triggers the quantum annealing process.
- Yuqian Zhao
- , Zhaohua Ma
- & Yuesheng Li
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Article
| Open AccessMagnetically propagating Hund’s exciton in van der Waals antiferromagnet NiPS3
Recently, excitons with unconventional properties were reported in a van der Waals antiferromagnet NiPS3. Here, using resonant inelastic x-ray scattering, the authors show that the formation of these excitons is primarily driven by Hund’s coupling and that they propagate similarly to two-magnon excitations.
- W. He
- , Y. Shen
- & M. P. M. Dean
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Article
| Open AccessPlanar thermal Hall effect from phonons in a Kitaev candidate material
The thermal Hall effect is a novel probe of neutral excitations in insulators; however, the mechanism behind one type of neutral excitations – phonons – is still unclear. Here the authors observe a planar thermal Hall effect in the Kitaev candidate material Na2Co2TeO6 and proposed that it is generated by phonons.
- Lu Chen
- , Étienne Lefrançois
- & Louis Taillefer
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Article
| Open AccessFlower-shaped 2D crystals grown in curved fluid vesicle membranes
Thin crystals grown on rigid spherical templates of increasing curvature exhibit increased protrusions. Here, the authors demonstrate the opposite curvature effect on the morphology of molecularly thin crystals grown within elastic fluid membranes, like those of biological cells.
- Hao Wan
- , Geunwoong Jeon
- & Maria M. Santore
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Article
| Open AccessQuantum critical phase of FeO spans conditions of Earth’s lower mantle
Large-scale eDMFT computation reveals that FeO undergoes a gradual orbitally selective insulator-metal transition across the extreme conditions of Earth’s interior, with implications for compositions and conductivity of the core-mantle boundary region.
- Wai-Ga D. Ho
- , Peng Zhang
- & Vasilije V. Dobrosavljevic
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| Open AccessCorrelation between two distant quasiparticles in separate superconducting islands mediated by a single spin
The authors experimentally study a chain of superconducting islands (SI) and quantum dots (QD), where a Bogoliubov quasiparticle occupies each SI. They demonstrate correlations between the quasiparticles in each SI mediated by a single spin on the QD, known as an “over-screened" doublet state of the QD.
- Juan Carlos Estrada Saldaña
- , Alexandros Vekris
- & Jesper Nygård
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Article
| Open AccessRoom-temperature stabilizing strongly competing ferrielectric and antiferroelectric phases in PbZrO3 by strain-mediated phase separation
There is a desire to know how the threefold ferrielectric coexists with the antiferroelectric phase. Here, the authors realize a threefold-modulated ferrielectric phase regulated by strain-mediated phase separation in PbZrO3 thin film.
- Ziyi Yu
- , Ningbo Fan
- & Fangfang Xu
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Article
| Open AccessDualistic insulator states in 1T-TaS2 crystals
While monolayer of 1T-TaS2 is considered to be a Mott insulator, the nature of the bulk insulating state is debated. Here the authors introduce a ladder-type structures with fractional misalignment of adjacent layers, showing that it becomes a Mott insulator due to decoupling between the layers.
- Yihao Wang
- , Zhihao Li
- & Liang Cao
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| Open AccessAtomic-scale observation of localized phonons at FeSe/SrTiO3 interface
The authors characterize the phonon modes at the FeSe/SrTiO3 interface with atomically resolved electron energy loss spectroscopy and correlate them with accurate atomic structure in an electron microscope. They find several phonon modes highly localized at the interface, one of which engages in strong interactions with the electrons in FeSe.
- Ruochen Shi
- , Qize Li
- & Peng Gao
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Article
| Open AccessMeasuring statistics-induced entanglement entropy with a Hong–Ou–Mandel interferometer
Measuring quantum entanglement remains a demanding task. The authors introduce two functions to quantify entanglement induced by fermionic or bosonic statistics, in transport experiments. Both functions, in theory and experiment, are remarkably resilient against the nonuniversal effects of interactions.
- Gu Zhang
- , Changki Hong
- & Yuval Gefen
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Article
| Open AccessFabrication-induced even-odd discrepancy of magnetotransport in few-layer MnBi2Te4
MnBi2Te4 is an antiferromagnetic topological insulator. This combination of magnetic ordering and topological properties has resulted in intense interest, however, like many van der Waals materials, experimental results are hampered by fabrication difficulties. Here, Li, Wang, Lian et al. show that the fabrication process itself can result in mismatched thickness dependence of magneto-transport measurements. ‘
- Yaoxin Li
- , Yongchao Wang
- & Chang Liu
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Article
| Open AccessAtomic-scale visualization of the interlayer Rydberg exciton complex in moiré heterostructures
Recently, Rydberg excitons have been demonstrated in transition metal dichalcogenide moire superlattices. Here, using atomic-scale imaging, the authors observe Rydberg structure and moire periodicity of ground-state interlayer excitons in a monolayer YbCl3 on highly oriented pyrolytic graphite.
- Meng Zhao
- , Zhongjie Wang
- & Chunlei Gao
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Article
| Open AccessStable skyrmion bundles at room temperature and zero magnetic field in a chiral magnet
Manipulation of topological charge at room temperature is a key tenet of skyrmionics. Here, the authors demonstrate tunable topological charges in skyrmion bundles at room temperature and zero magnetic field.
- Yongsen Zhang
- , Jin Tang
- & Haifeng Du
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Article
| Open AccessOrphan high field superconductivity in non-superconducting uranium ditelluride
In addition to its low-field superconducting state, UTe2 features a re-entrant superconducting state when high magnetic fields are applied at a particular range of angles. Here, the authors demonstrate that the high-field re-entrant superconducting state survives even when the low-field superconducting state is destroyed by disorder.
- Corey E. Frank
- , Sylvia K. Lewin
- & Nicholas P. Butch
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Article
| Open AccessElectronic inhomogeneity and phase fluctuation in one-unit-cell FeSe films
The authors study monolayer FeSe via scanning tunneling microscopy and simultaneous micron-scale-probe-based transport. They observe distinct superconducting phases in domains and on boundaries between domains, with different superconducting gaps and pairing temperatures.
- Dapeng Zhao
- , Wenqiang Cui
- & Qi-Kun Xue
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Article
| Open AccessIron alloys of volatile elements in the deep Earth’s interior
Many volatile elements are depleted in the bulk silicate Earth. Here, the authors found that these volatile elements tend to react with Fe under pressure and may be sequestered within Earth’s core by forming substitutional Fe alloys.
- Yifan Tian
- , Peiyu Zhang
- & Hanyu Liu
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Article
| Open AccessExciton polariton condensation from bound states in the continuum at room temperature
Bound states in continuum have attracted attention in various platforms, and recently condensation of bound states in continuum polariton modes was demonstrated at low temperatures. Here the authors report the observation of such a state in a periodic air-hole perovskite-based photonic crystal at room temperature.
- Xianxin Wu
- , Shuai Zhang
- & Xinfeng Liu
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Article
| Open AccessRe-order parameter of interacting thermodynamic magnets
Phase diagrams of materials are typically based on a static order parameter, but it faces challenges when distinguishing subtle phase changes, such as re-ordering. Here the authors introduce a dynamic re-order parameter, in particular magnons, and illustrate it in a material with complex magnetic phases.
- Byung Cheol Park
- , Howon Lee
- & Taewoo Ha
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Article
| Open AccessDefect scattering can lead to enhanced phonon transport at nanoscale
Defects in materials are well known to suppress thermal transport. Here, the authors demonstrate that introducing defects in nanoscale heating zone enhances thermal conductance by up to 75% through reducing directional phonon nonequilibrium.
- Yue Hu
- , Jiaxuan Xu
- & Hua Bao
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Article
| Open AccessInterface-induced dual-pinning mechanism enhances low-frequency electromagnetic wave loss
This paper proposes a dual-pinning mechanism induced by a magneto-electric bias interface and uses it to designs a double-layer core-shell structure, demonstrating that the mechanism improves electromagnetic wave absorption in the low-frequency bands.
- Bo Cai
- , Lu Zhou
- & Guang-Sheng Wang
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Article
| Open AccessCorrelation-driven nonequilibrium exciton site transition in a WSe2/WS2 moiré supercell
Correlated insulator states of moire excitons in transition metal dichalcogenide heterostructures have attracted significant attention recently. Here the authors use time-resolved pump-probe spectroscopy to demonstrate the effects of non-equilibrium correlations of moire excitons in WSe2/WS2 heterobilayers.
- Jinjae Kim
- , Jiwon Park
- & Hyunyong Choi
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Article
| Open AccessUsing strain to uncover the interplay between two- and three-dimensional charge density waves in high-temperature superconducting YBa2Cu3Oy
Strain is a valuable tuning knob for studying the electronic properties of quantum materials. Here, the authors use strain to modulate and study the competition between 2D and 3D charge orders in a high-temperature superconductor.
- I. Vinograd
- , S. M. Souliou
- & M. Le Tacon
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Article
| Open AccessDistinct skyrmion phases at room temperature in two-dimensional ferromagnet Fe3GaTe2
Most 2D magnets support only a single skyrmion phase. Here, the authors observe two distinct topological phases: Bloch and hybrid skyrmions, with high thermostability in the room-temperature ferromagnet Fe3GaTe2.
- Xiaowei Lv
- , Hualiang Lv
- & Renchao Che
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