1
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Plisson VM, Yao X, Wang Y, Varnavides G, Suslov A, Graf D, Choi ES, Yang HY, Wang Y, Romanelli M, McNamara G, Singh B, McCandless GT, Chan JY, Narang P, Tafti F, Burch KS. Engineering Anomalously Large Electron Transport in Topological Semimetals. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2310944. [PMID: 38470991 DOI: 10.1002/adma.202310944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 02/28/2024] [Indexed: 03/14/2024]
Abstract
Anomalous transport of topological semimetals has generated significant interest for applications in optoelectronics, nanoscale devices, and interconnects. Understanding the origin of novel transport is crucial to engineering the desired material properties, yet their orders of magnitude higher transport than single-particle mobilities remain unexplained. This work demonstrates the dramatic mobility enhancements result from phonons primarily returning momentum to electrons due to phonon-electron dominating over phonon-phonon scattering. Proving this idea, proposed by Peierls in 1932, requires tuning electron and phonon dispersions without changing symmetry, topology, or disorder. This is achieved by combining de Haas - van Alphen (dHvA), electron transport, Raman scattering, and first-principles calculations in the topological semimetals MX2 (M = Nb, Ta and X = Ge, Si). Replacing Ge with Si brings the transport mobilities from an order magnitude larger than single particle ones to nearly balanced. This occurs without changing the crystal structure or topology and with small differences in disorder or Fermi surface. Simultaneously, Raman scattering and first-principles calculations establish phonon-electron dominated scattering only in the MGe2 compounds. Thus, this study proves that phonon-drag is crucial to the transport properties of topological semimetals and provides insight to engineer these materials further.
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Affiliation(s)
| | - Xiaohan Yao
- Department of Physics, Boston College, Chestnut Hill, MA, USA
| | - Yaxian Wang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - George Varnavides
- College of Letters and Science, University of California Los Angeles, Los Angeles, California, 90095, USA
| | - Alexey Suslov
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida, 32310, USA
| | - David Graf
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida, 32310, USA
| | - Eun Sang Choi
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida, 32310, USA
| | - Hung-Yu Yang
- Department of Physics, Boston College, Chestnut Hill, MA, USA
| | - Yiping Wang
- Department of Physics, Boston College, Chestnut Hill, MA, USA
| | | | - Grant McNamara
- Department of Physics, Boston College, Chestnut Hill, MA, USA
| | - Birender Singh
- Department of Physics, Boston College, Chestnut Hill, MA, USA
| | - Gregory T McCandless
- Department of Chemistry and Biochemisty, Baylor University, Waco, TX, 76798, USA
| | - Julia Y Chan
- Department of Chemistry and Biochemisty, Baylor University, Waco, TX, 76798, USA
| | - Prineha Narang
- College of Letters and Science, University of California Los Angeles, Los Angeles, California, 90095, USA
| | - Fazel Tafti
- Department of Physics, Boston College, Chestnut Hill, MA, USA
| | - Kenneth S Burch
- Department of Physics, Boston College, Chestnut Hill, MA, USA
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2
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Tzschaschel C, Qiu JX, Gao XJ, Li HC, Guo C, Yang HY, Zhang CP, Xie YM, Liu YF, Gao A, Bérubé D, Dinh T, Ho SC, Fang Y, Huang F, Nordlander J, Ma Q, Tafti F, Moll PJW, Law KT, Xu SY. Nonlinear optical diode effect in a magnetic Weyl semimetal. Nat Commun 2024; 15:3017. [PMID: 38589414 DOI: 10.1038/s41467-024-47291-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Accepted: 03/27/2024] [Indexed: 04/10/2024] Open
Abstract
Diode effects are of great interest for both fundamental physics and modern technologies. Electrical diode effects (nonreciprocal transport) have been observed in Weyl systems. Optical diode effects arising from the Weyl fermions have been theoretically considered but not probed experimentally. Here, we report the observation of a nonlinear optical diode effect (NODE) in the magnetic Weyl semimetal CeAlSi, where the magnetization introduces a pronounced directionality in the nonlinear optical second-harmonic generation (SHG). We demonstrate a six-fold change of the measured SHG intensity between opposite propagation directions over a bandwidth exceeding 250 meV. Supported by density-functional theory, we establish the linearly dispersive bands emerging from Weyl nodes as the origin of this broadband effect. We further demonstrate current-induced magnetization switching and thus electrical control of the NODE. Our results advance ongoing research to identify novel nonlinear optical/transport phenomena in magnetic topological materials and further opens new pathways for the unidirectional manipulation of light.
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Affiliation(s)
- Christian Tzschaschel
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, 02138, USA.
- Max-Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Berlin, Germany.
| | - Jian-Xiang Qiu
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, 02138, USA
| | - Xue-Jian Gao
- Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
| | - Hou-Chen Li
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, 02138, USA
| | - Chunyu Guo
- Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany
- Laboratory of Quantum Materials (QMAT), Institute of Materials (IMX), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015, Lausanne, Switzerland
| | - Hung-Yu Yang
- Department of Physics, Boston College, Chestnut Hill, MA, USA
| | - Cheng-Ping Zhang
- Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
| | - Ying-Ming Xie
- Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
| | - Yu-Fei Liu
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, 02138, USA
| | - Anyuan Gao
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, 02138, USA
| | - Damien Bérubé
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, 02138, USA
| | - Thao Dinh
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, 02138, USA
| | - Sheng-Chin Ho
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, 02138, USA
| | - Yuqiang Fang
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai, China
- State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering Peking University, Beijing, China
| | - Fuqiang Huang
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai, China
- State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering Peking University, Beijing, China
| | | | - Qiong Ma
- Department of Physics, Boston College, Chestnut Hill, MA, USA
- CIFAR Azrieli Global Scholars program, CIFAR, Toronto, Ontario, Canada
| | - Fazel Tafti
- Department of Physics, Boston College, Chestnut Hill, MA, USA
| | - Philip J W Moll
- Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany
- Laboratory of Quantum Materials (QMAT), Institute of Materials (IMX), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015, Lausanne, Switzerland
| | - Kam Tuen Law
- Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
| | - Su-Yang Xu
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, 02138, USA.
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3
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Cheng E, Yan L, Shi X, Lou R, Fedorov A, Behnami M, Yuan J, Yang P, Wang B, Cheng JG, Xu Y, Xu Y, Xia W, Pavlovskii N, Peets DC, Zhao W, Wan Y, Burkhardt U, Guo Y, Li S, Felser C, Yang W, Büchner B. Tunable positions of Weyl nodes via magnetism and pressure in the ferromagnetic Weyl semimetal CeAlSi. Nat Commun 2024; 15:1467. [PMID: 38368411 PMCID: PMC10874455 DOI: 10.1038/s41467-024-45658-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Accepted: 01/30/2024] [Indexed: 02/19/2024] Open
Abstract
The noncentrosymmetric ferromagnetic Weyl semimetal CeAlSi with simultaneous space-inversion and time-reversal symmetry breaking provides a unique platform for exploring novel topological states. Here, by employing multiple experimental techniques, we demonstrate that ferromagnetism and pressure can serve as efficient parameters to tune the positions of Weyl nodes in CeAlSi. At ambient pressure, a magnetism-facilitated anomalous Hall/Nernst effect (AHE/ANE) is uncovered. Angle-resolved photoemission spectroscopy (ARPES) measurements demonstrated that the Weyl nodes with opposite chirality are moving away from each other upon entering the ferromagnetic phase. Under pressure, by tracing the pressure evolution of AHE and band structure, we demonstrate that pressure could also serve as a pivotal knob to tune the positions of Weyl nodes. Moreover, multiple pressure-induced phase transitions are also revealed. These findings indicate that CeAlSi provides a unique and tunable platform for exploring exotic topological physics and electron correlations, as well as catering to potential applications, such as spintronics.
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Affiliation(s)
- Erjian Cheng
- Leibniz Institute for Solid State and Materials Research (IFW-Dresden), 01069, Dresden, Germany.
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.
| | - Limin Yan
- Center for High Pressure Science and Technology Advanced Research, 201203, Shanghai, China
- State Key Laboratory of Superhard Materials, Department of Physics, Jilin University, 130012, Changchun, China
| | - Xianbiao Shi
- State Key Laboratory of Advanced Welding & Joining, Harbin Institute of Technology, 150001, Harbin, China
- Flexible Printed Electronics Technology Center, Harbin Institute of Technology (Shenzhen), 518055, Shenzhen, China
| | - Rui Lou
- Leibniz Institute for Solid State and Materials Research (IFW-Dresden), 01069, Dresden, Germany.
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489, Berlin, Germany.
- Joint Laboratory "Functional Quantum Materials" at BESSY II, 12489, Berlin, Germany.
| | - Alexander Fedorov
- Leibniz Institute for Solid State and Materials Research (IFW-Dresden), 01069, Dresden, Germany
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489, Berlin, Germany
- Joint Laboratory "Functional Quantum Materials" at BESSY II, 12489, Berlin, Germany
| | - Mahdi Behnami
- Leibniz Institute for Solid State and Materials Research (IFW-Dresden), 01069, Dresden, Germany
| | - Jian Yuan
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China
| | - Pengtao Yang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China
- School of Physical Sciences, University of Chinese Academy of Sciences, 100190, Beijing, China
| | - Bosen Wang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China
- School of Physical Sciences, University of Chinese Academy of Sciences, 100190, Beijing, China
| | - Jin-Guang Cheng
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China
- School of Physical Sciences, University of Chinese Academy of Sciences, 100190, Beijing, China
| | - Yuanji Xu
- Institute for Applied Physics, University of Science and Technology Beijing, 100083, Beijing, China
| | - Yang Xu
- Key Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal University, 200241, Shanghai, China
| | - Wei Xia
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China
| | - Nikolai Pavlovskii
- Institute of Solid State and Materials Physics, Technische Universität Dresden, 01069, Dresden, Germany
| | - Darren C Peets
- Institute of Solid State and Materials Physics, Technische Universität Dresden, 01069, Dresden, Germany
| | - Weiwei Zhao
- State Key Laboratory of Advanced Welding & Joining, Harbin Institute of Technology, 150001, Harbin, China
- Flexible Printed Electronics Technology Center, Harbin Institute of Technology (Shenzhen), 518055, Shenzhen, China
| | - Yimin Wan
- State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, 200438, Shanghai, China
| | - Ulrich Burkhardt
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany
| | - Yanfeng Guo
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China
| | - Shiyan Li
- State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, 200438, Shanghai, China
- Collaborative Innovation Center of Advanced Microstructures, 210093, Nanjing, China
- Shanghai Research Center for Quantum Sciences, 201315, Shanghai, China
| | - Claudia Felser
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany
| | - Wenge Yang
- Center for High Pressure Science and Technology Advanced Research, 201203, Shanghai, China.
| | - Bernd Büchner
- Leibniz Institute for Solid State and Materials Research (IFW-Dresden), 01069, Dresden, Germany.
- Institute of Solid State and Materials Physics and Würzburg-Dresden Cluster of Excellence-ct.qmat, Technische Universität Dresden, 01062, Dresden, Germany.
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4
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Li C, Zhang J, Wang Y, Liu H, Guo Q, Rienks E, Chen W, Bertran F, Yang H, Phuyal D, Fedderwitz H, Thiagarajan B, Dendzik M, Berntsen MH, Shi Y, Xiang T, Tjernberg O. Emergence of Weyl fermions by ferrimagnetism in a noncentrosymmetric magnetic Weyl semimetal. Nat Commun 2023; 14:7185. [PMID: 37938548 PMCID: PMC10632385 DOI: 10.1038/s41467-023-42996-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Accepted: 10/26/2023] [Indexed: 11/09/2023] Open
Abstract
Condensed matter physics has often provided a platform for investigating the interplay between particles and fields in cases that have not been observed in high-energy physics. Here, using angle-resolved photoemission spectroscopy, we provide an example of this by visualizing the electronic structure of a noncentrosymmetric magnetic Weyl semimetal candidate NdAlSi in both the paramagnetic and ferrimagnetic states. We observe surface Fermi arcs and bulk Weyl fermion dispersion as well as the emergence of new Weyl fermions in the ferrimagnetic state. Our results establish NdAlSi as a magnetic Weyl semimetal and provide an experimental observation of ferrimagnetic regulation of Weyl fermions in condensed matter.
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Affiliation(s)
- Cong Li
- Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, 11419, Sweden.
- Department of Applied Physics, Stanford University, Stanford, CA, 94305, USA.
| | - Jianfeng Zhang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Yang Wang
- Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, 11419, Sweden
| | - Hongxiong Liu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Qinda Guo
- Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, 11419, Sweden
| | - Emile Rienks
- Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II, Albert-Einstein-Straße 15, 12489, Berlin, Germany
| | - Wanyu Chen
- Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, 11419, Sweden
| | - Francois Bertran
- Synchrotron SOLEIL, L'Orme des Merisiers, Départementale 128, 91190, Saint-Aubin, France
| | - Huancheng Yang
- Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing, 100872, China
| | - Dibya Phuyal
- Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, 11419, Sweden
| | | | | | - Maciej Dendzik
- Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, 11419, Sweden
| | - Magnus H Berntsen
- Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, 11419, Sweden
| | - Youguo Shi
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Tao Xiang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Oscar Tjernberg
- Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, 11419, Sweden.
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5
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Drucker NC, Nguyen T, Han F, Siriviboon P, Luo X, Andrejevic N, Zhu Z, Bednik G, Nguyen QT, Chen Z, Nguyen LK, Liu T, Williams TJ, Stone MB, Kolesnikov AI, Chi S, Fernandez-Baca J, Nelson CS, Alatas A, Hogan T, Puretzky AA, Huang S, Yu Y, Li M. Topology stabilized fluctuations in a magnetic nodal semimetal. Nat Commun 2023; 14:5182. [PMID: 37626027 PMCID: PMC10457388 DOI: 10.1038/s41467-023-40765-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 08/07/2023] [Indexed: 08/27/2023] Open
Abstract
The interplay between magnetism and electronic band topology enriches topological phases and has promising applications. However, the role of topology in magnetic fluctuations has been elusive. Here, we report evidence for topology stabilized magnetism above the magnetic transition temperature in magnetic Weyl semimetal candidate CeAlGe. Electrical transport, thermal transport, resonant elastic X-ray scattering, and dilatometry consistently indicate the presence of locally correlated magnetism within a narrow temperature window well above the thermodynamic magnetic transition temperature. The wavevector of this short-range order is consistent with the nesting condition of topological Weyl nodes, suggesting that it arises from the interaction between magnetic fluctuations and the emergent Weyl fermions. Effective field theory shows that this topology stabilized order is wavevector dependent and can be stabilized when the interband Weyl fermion scattering is dominant. Our work highlights the role of electronic band topology in stabilizing magnetic order even in the classically disordered regime.
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Affiliation(s)
- Nathan C Drucker
- Quantum Measurement Group, MIT, Cambridge, MA, USA.
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA.
| | - Thanh Nguyen
- Quantum Measurement Group, MIT, Cambridge, MA, USA
- Department of Nuclear Science and Engineering, MIT, Cambridge, MA, USA
| | - Fei Han
- Quantum Measurement Group, MIT, Cambridge, MA, USA
- Department of Nuclear Science and Engineering, MIT, Cambridge, MA, USA
| | - Phum Siriviboon
- Quantum Measurement Group, MIT, Cambridge, MA, USA
- Department of Physics, MIT, Cambridge, MA, USA
| | - Xi Luo
- College of Science, University of Shanghai for Science and Technology, Shanghai, China
| | | | - Ziming Zhu
- School of Physics and Electronics, Hunan Normal University, Changsha, China
| | - Grigory Bednik
- Department of Nuclear Science and Engineering, MIT, Cambridge, MA, USA
| | | | - Zhantao Chen
- SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | | | | | - Travis J Williams
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Matthew B Stone
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | | | - Songxue Chi
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | | | - Christie S Nelson
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, USA
| | - Ahmet Alatas
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL, USA
| | - Tom Hogan
- Quantum Design, Inc., San Diego, CA, USA
| | - Alexander A Puretzky
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Shengxi Huang
- Department of Electrical Engineering, Rice University, Houston, TX, USA
| | - Yue Yu
- Department of Physics and State Key Laboratory of Surface Physics, Fudan University, Shanghai, China.
| | - Mingda Li
- Quantum Measurement Group, MIT, Cambridge, MA, USA.
- Department of Nuclear Science and Engineering, MIT, Cambridge, MA, USA.
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6
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Simeth W, Bauer A, Franz C, Aqeel A, Bereciartua PJ, Sears JA, Francoual S, Back CH, Pfleiderer C. Resonant Elastic X-Ray Scattering of Antiferromagnetic Superstructures in EuPtSi_{3}. PHYSICAL REVIEW LETTERS 2023; 130:266701. [PMID: 37450805 DOI: 10.1103/physrevlett.130.266701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 04/06/2023] [Accepted: 05/11/2023] [Indexed: 07/18/2023]
Abstract
We report resonant elastic x-ray scattering of long-range magnetic order in EuPtSi_{3}, combining different scattering geometries with full linear polarization analysis to unambiguously identify magnetic scattering contributions. At low temperatures, EuPtSi_{3} stabilizes type A antiferromagnetism featuring various long-wavelength modulations. For magnetic fields applied in the hard magnetic basal plane, well-defined regimes of cycloidal, conical, and fanlike superstructures may be distinguished that encompass a pocket of commensurate type A order without superstructure. For magnetic field applied along the easy axis, the phase diagram comprises the cycloidal and conical superstructures only. Highlighting the power of polarized resonant elastic x-ray scattering, our results reveal a combination of magnetic phases that suggest a highly unusual competition between antiferromagnetic exchange interactions with Dzyaloshinsky-Moriya spin-orbit coupling of similar strength.
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Affiliation(s)
- Wolfgang Simeth
- Physik-Department, Technische Universität München, D-85748 Garching, Germany
- Laboratory for Neutron and Muon Instrumentation, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - Andreas Bauer
- Physik-Department, Technische Universität München, D-85748 Garching, Germany
- Zentrum für QuantumEngineering (ZQE), Technische Universität München, D-85748 Garching, Germany
| | - Christian Franz
- Physik-Department, Technische Universität München, D-85748 Garching, Germany
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), D-85748 Garching, Germany
| | - Aisha Aqeel
- Physik-Department, Technische Universität München, D-85748 Garching, Germany
- Munich Center for Quantum Science and Technology (MCQST), Technische Universität München, D-85748 Garching, Germany
| | | | - Jennifer A Sears
- Deutsches Elektronen-Synchrotron (DESY), D-22607 Hamburg, Germany
| | - Sonia Francoual
- Deutsches Elektronen-Synchrotron (DESY), D-22607 Hamburg, Germany
| | - Christian H Back
- Physik-Department, Technische Universität München, D-85748 Garching, Germany
- Zentrum für QuantumEngineering (ZQE), Technische Universität München, D-85748 Garching, Germany
- Munich Center for Quantum Science and Technology (MCQST), Technische Universität München, D-85748 Garching, Germany
| | - Christian Pfleiderer
- Physik-Department, Technische Universität München, D-85748 Garching, Germany
- Zentrum für QuantumEngineering (ZQE), Technische Universität München, D-85748 Garching, Germany
- Munich Center for Quantum Science and Technology (MCQST), Technische Universität München, D-85748 Garching, Germany
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7
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Breitkreiz M, Brouwer PW. Fermi-Arc Metals. PHYSICAL REVIEW LETTERS 2023; 130:196602. [PMID: 37243660 DOI: 10.1103/physrevlett.130.196602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 03/09/2023] [Accepted: 04/27/2023] [Indexed: 05/29/2023]
Abstract
We predict a novel metallic state of matter that emerges in a Weyl-semimetal superstructure with spatially varying Weyl-node positions. In the new state, the Weyl nodes are stretched into extended, anisotropic Fermi surfaces, which can be understood as being built from Fermi arclike states. This "Fermi-arc metal" exhibits the chiral anomaly of the parental Weyl semimetal. However, unlike in the parental Weyl semimetal, in the Fermi-arc metal the "ultraquantum state," in which the anomalous chiral Landau level is the only state at the Fermi energy, is already reached for a finite energy window at zero magnetic field. The dominance of the ultraquantum state implies a universal low-field ballistic magnetoconductance and the absence of quantum oscillations, making the Fermi surface "invisible" to de Haas-van Alphen and Shubnikov-de Haas effects, although it signifies its presence in other response properties.
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Affiliation(s)
- Maxim Breitkreiz
- Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany
| | - Piet W Brouwer
- Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany
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8
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Li Z, Yin Q, Jiang Y, Zhu Z, Gao Y, Wang S, Shen J, Zhao T, Cai J, Lei H, Lin SZ, Zhang Y, Shen B. Discovery of Topological Magnetic Textures near Room Temperature in Quantum Magnet TbMn 6 Sn 6. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2211164. [PMID: 36856016 DOI: 10.1002/adma.202211164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 02/19/2023] [Indexed: 05/19/2023]
Abstract
The study of topology in quantum materials has fundamentally advanced the understanding in condensed matter physics and potential applications in next-generation quantum information technology. Recently, the discovery of a topological Chern phase in the spin-orbit-coupled Kagome lattice TbMn6 Sn6 has attracted considerable interest. Whereas these phenomena highlight the contribution of momentum space Berry curvature and Chern gap on the electronic transport properties, less is known about the intrinsic real space magnetic texture, which is crucial for understanding the electronic properties and further exploring the unique quantum behavior. Here, the stabilization of topological magnetic skyrmions in TbMn6 Sn6 using Lorentz transmission electron microscopy near room temperature, where the spins experience full spin reorientation transition between the a- and c-axes, is directly observed. An effective spin Hamiltonian based on the Ginzburg-Landau theory is constructed and micromagnetic simulation is performed to clarify the critical role of Ruderman-Kittel-Kasuya-Yosida interaction on the stabilization of skyrmion lattice. These results not only uncover nontrivial spin topological texture in TbMn6 Sn6 , but also provide a solid basis to study its interplay with electronic topology.
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Affiliation(s)
- Zhuolin Li
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 101408, China
| | - Qiangwei Yin
- Laboratory for Neutron Scattering, Beijing Key Laboratory of Opto-Electronic Functional Materials & Micro-Nano Devices, Department of Physics, Renmin University of China, Beijing, 100872, China
| | - Yi Jiang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 101408, China
| | - ZhaoZhao Zhu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 101408, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong, 523808, China
| | - Yang Gao
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 101408, China
- School of Materials Science and Engineering, Anhui University, Hefei, 230601, China
| | - Shouguo Wang
- School of Materials Science and Engineering, Anhui University, Hefei, 230601, China
| | - Jun Shen
- Department of Energy and Power Engineering, School of Mechanical Engineering, Beijing Institute of Technology, Beijing, 100081, China
| | - Tongyun Zhao
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 101408, China
| | - Jianwang Cai
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 101408, China
| | - Hechang Lei
- Laboratory for Neutron Scattering, Beijing Key Laboratory of Opto-Electronic Functional Materials & Micro-Nano Devices, Department of Physics, Renmin University of China, Beijing, 100872, China
| | - Shi-Zeng Lin
- Theoretical Division and Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Ying Zhang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 101408, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong, 523808, China
| | - Baogen Shen
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 101408, China
- Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang, 315201, China
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9
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Cho K, Shon W, Bae J, Lee J, Yoon S, Kim J, Rhyee JS, Cho B. Anisotropic Metamagnetic Spin Reorientation and Rotational Magnetocaloric Effect of Single Crystal NdAlGe. MATERIALS (BASEL, SWITZERLAND) 2023; 16:2771. [PMID: 37049065 PMCID: PMC10095856 DOI: 10.3390/ma16072771] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 03/27/2023] [Accepted: 03/28/2023] [Indexed: 06/19/2023]
Abstract
Magnetic anisotropy strongly influences the performance of the magnetocaloric effect. We investigated the magnetocaloric properties of the NdAlGe single crystal with I41md structure. The temperature-dependent magnetization revealed significant anisotropic properties; stable antiferromagnetic transition at TN = 6 K for H//a and meta-magnetic spin reorientation at low temperature (T ≤ 5 K) within an intermediate field (H = 2 T) for H//c. During the metamagnetic spin reorientation, the abrupt change of the magnetic entropy leads to a significant magnetocaloric effect with negative magnetic entropy change (∆SM) by -13.80 J kg-1 K-1 at TC = 5.5 K for H = 5 T along the H//c axis. In addition, the antiferromagnetic state for H//a shows the inverse magnetocaloric effect(I-MCE) by positive entropy change ∆SM = 2.64 J kg-1 K-1 at TN = 6 K for H = 5 T. This giant MCE accompanied by the metamagnetic transition resulted in a significantly large relative cooling power (158 J/kg at H = 5 T) for H//c. The giant MCE and I-MCE can be applied to the rotational magnetocaloric effect (R-MCE) depending on the crystal orientations. NdAlGe exhibits rotational entropy change ∆Sc-a = -12.85 J kg-1 K at Tpeak = 7.5 K, H = 5 T. With comparison to conventional MCE materials, NdAlGe is suggested as promising candidate of R-MCE, which is a novel type of magnetic refrigeration system.
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Affiliation(s)
- Keunki Cho
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
- Green Energy and Nano Technology R&D Group, Korea Institute of Industrial Technology, Gwangju 61012, Republic of Korea
| | - Wonhyuk Shon
- Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea
| | - Jaehan Bae
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
| | - Jaewoong Lee
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
| | - Seungha Yoon
- Green Energy and Nano Technology R&D Group, Korea Institute of Industrial Technology, Gwangju 61012, Republic of Korea
| | - Jinhee Kim
- Department of Applied Physics, Institute of Natural Sciences, Kyung Hee University, Yongin 17104, Republic of Korea
| | - Jong-Soo Rhyee
- Department of Applied Physics, Institute of Natural Sciences, Kyung Hee University, Yongin 17104, Republic of Korea
| | - Beongki Cho
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
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10
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Fujisawa Y, Pardo-Almanza M, Hsu CH, Mohamed A, Yamagami K, Krishnadas A, Chang G, Chuang FC, Khoo KH, Zang J, Soumyanarayanan A, Okada Y. Widely Tunable Berry Curvature in the Magnetic Semimetal Cr 1+ δ Te 2. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2207121. [PMID: 36642840 DOI: 10.1002/adma.202207121] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 11/17/2022] [Indexed: 06/17/2023]
Abstract
Magnetic semimetals have increasingly emerged as lucrative platforms hosting spin-based topological phenomena in real and momentum spaces. Cr1+ δ Te2 is a self-intercalated magnetic transition metal dichalcogenide (TMD), which exhibits topological magnetism and tunable electron filling. While recent studies have explored real-space Berry curvature effects, similar considerations of momentum-space Berry curvature are lacking. Here, the electronic structure and transport properties of epitaxial Cr1+ δ Te2 thin films are systematically investigated over a range of doping, δ (0.33 - 0.71). Spectroscopic experiments reveal the presence of a characteristic semi-metallic band region, which shows a rigid like energy shift with δ. Transport experiments show that the intrinsic component of the anomalous Hall effect (AHE) is sizable and undergoes a sign flip across δ. Finally, density functional theory calculations establish a link between the doping evolution of the band structure and AHE: the AHE sign flip is shown to emerge from the sign change of the Berry curvature, as the semi-metallic band region crosses the Fermi energy. These findings underscore the increasing relevance of momentum-space Berry curvature in magnetic TMDs and provide a unique platform for intertwining topological physics in real and momentum spaces.
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Affiliation(s)
- Yuita Fujisawa
- Quantum Materials Science Unit, Okinawa Institute of Science and Technology (OIST), Okinawa, 904-0495, Japan
| | - Markel Pardo-Almanza
- Quantum Materials Science Unit, Okinawa Institute of Science and Technology (OIST), Okinawa, 904-0495, Japan
| | - Chia-Hsiu Hsu
- Quantum Materials Science Unit, Okinawa Institute of Science and Technology (OIST), Okinawa, 904-0495, Japan
- Department of Physics, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
- Physics Division, National Center for Theoretical Sciences, Taipei, 10617, Taiwan
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Atwa Mohamed
- Quantum Materials Science Unit, Okinawa Institute of Science and Technology (OIST), Okinawa, 904-0495, Japan
| | - Kohei Yamagami
- Quantum Materials Science Unit, Okinawa Institute of Science and Technology (OIST), Okinawa, 904-0495, Japan
| | - Anjana Krishnadas
- Quantum Materials Science Unit, Okinawa Institute of Science and Technology (OIST), Okinawa, 904-0495, Japan
| | - Guoqing Chang
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Feng-Chuan Chuang
- Department of Physics, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
- Physics Division, National Center for Theoretical Sciences, Taipei, 10617, Taiwan
- Center for Theoretical and Computational Physics, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
| | - Khoong Hong Khoo
- Institute of High Performance Computing, Agency for Science Technology and Research, Singapore, 138632, Singapore
| | - Jiadong Zang
- Department of Physics and Astronomy, University of New Hampshire, Durham, NH 03824, USA
- Materials Science Program, University of New Hampshire, Durham, NH 03824, USA
| | - Anjan Soumyanarayanan
- Department of Physics, National University of Singapore, Singapore, 117551, Singapore
- Institute of Materials Research and Engineering, Agency for Science Technology and Research, Singapore, 138634, Singapore
| | - Yoshinori Okada
- Quantum Materials Science Unit, Okinawa Institute of Science and Technology (OIST), Okinawa, 904-0495, Japan
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11
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Bulk Physical Properties of a Magnetic Weyl Semimetal Candidate NdAlGe Grown by a Laser Floating-Zone Method. INORGANICS 2023. [DOI: 10.3390/inorganics11010020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
In this study, we report the successful growth of single crystals of a magnetic Weyl semimetal candidate NdAlGe with the space group I41md. The crystals were grown using a floating-zone technique, which used five laser diodes, with a total power of 2 kW, as the heat source. To ensure that the molten zone was stably formed during the growth, we employed a bell-shaped distribution profile of the vertical irradiation intensity. After the nominal powder, crushed from an arc-melted ingot, was shaped under hydrostatic pressure, we sintered the feed and seed rods in an Ar atmosphere under ultra-low oxygen partial pressure (<10−26 atm) generated by an oxygen pump made of yttria-stabilized zirconia heated at 873 K. Single crystals of NdAlGe were successfully grown to a length of 50 mm. The grown crystals showed magnetic order in bulk at 13.5 K. The fundamental physical properties were characterized by magnetic susceptibility, magnetization, specific heat, thermal expansion, and electrical resistivity measurements. This study demonstrates that the magnetic order induces anisotropic magnetoelasticity, magneto-entropy, and charge transport in NdAlGe.
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12
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Xu L, Niu H, Bai Y, Zhu H, Yuan S, He X, Han Y, Zhao L, Yang Y, Xia Z, Liang Q, Tian Z. Shubnikov-de Haas oscillations and nontrivial topological states in Weyl semimetal candidate SmAlSi. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:485701. [PMID: 36206748 DOI: 10.1088/1361-648x/ac987a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2022] [Accepted: 10/07/2022] [Indexed: 06/16/2023]
Abstract
The RAlX (R = Light rare earth; X = Ge, Si) compounds, as a family of magnetic Weyl semimetal, have recently attracted growing attention due to the tunability of Weyl nodes and its interactions with diverse magnetism by rare-earth atoms. Here, we report the magnetotransport evidence and electronic structure calculations on nontrivial band topology of SmAlSi, a new member of this family. At low temperatures, SmAlSi exhibits large non-saturated magnetoresistance (MR) (as large as ∼5500% at 2 K and 48 T) and distinct Shubnikov-de Haas (SdH) oscillations. The field dependent MRs at 2 K deviate from the semiclassical (μ0H)2variation but follow the power-law relation MR∝(μ0H)mwith a crossover fromm∼ 1.52 at low fields (μ0H< 15 T) tom∼ 1 under high fields (μ0H> 18 T), which is attributed to the existence of Weyl points and electron-hole compensated characteristics with high mobility. From the analysis of SdH oscillations, two fundamental frequencies originating from the Fermi surface pockets with non-trivialπBerry phases and small cyclotron mass can be identified, this feature is supported by the calculated electronic band structures with two Weyl pockets near the Fermi level. Our study establishes SmAlSi as a paradigm for researching the novel topological states of RAlX family.
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Affiliation(s)
- Longmeng Xu
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Haoyu Niu
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Yuming Bai
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Haipeng Zhu
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Songliu Yuan
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Xiong He
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Yibo Han
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Lingxiao Zhao
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Yang Yang
- School of Physics and Electronic Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, People's Republic of China
| | - Zhengcai Xia
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Qifeng Liang
- Department of Physics, Shaoxing University, Shaoxing 312000, People's Republic of China
| | - Zhaoming Tian
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
- Shenzhen Huazhong University of Science and Technology Research Institute, Shenzhen, Guangdong 518057, People's Republic of China
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13
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Hirschberger M, Tokura Y. Weyl fermions promote collective magnetism. NATURE MATERIALS 2021; 20:1592-1593. [PMID: 34815565 DOI: 10.1038/s41563-021-01133-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Affiliation(s)
- Max Hirschberger
- Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), The University of Tokyo, Bunkyo-ku, Tokyo, Japan.
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama, Japan.
| | - Yoshinori Tokura
- Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), The University of Tokyo, Bunkyo-ku, Tokyo, Japan
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama, Japan
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