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Spin fluctuation induced Weyl semimetal state in the paramagnetic phase of EuCd2As2.
Ma, J-Z; Nie, S M; Yi, C J; Jandke, J; Shang, T; Yao, M Y; Naamneh, M; Yan, L Q; Sun, Y; Chikina, A; Strocov, V N; Medarde, M; Song, M; Xiong, Y-M; Xu, G; Wulfhekel, W; Mesot, J; Reticcioli, M; Franchini, C; Mudry, C; Müller, M; Shi, Y G; Qian, T; Ding, H; Shi, M.
Affiliation
  • Ma JZ; Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
  • Nie SM; Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne, CH-10 15 Lausanne, Switzerland.
  • Yi CJ; Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA.
  • Jandke J; Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
  • Shang T; School of Physics, University of Chinese Academy of Sciences, Beijing 100190, China.
  • Yao MY; Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
  • Naamneh M; Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
  • Yan LQ; Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne, CH-10 15 Lausanne, Switzerland.
  • Sun Y; Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
  • Chikina A; Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
  • Strocov VN; Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
  • Medarde M; Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
  • Song M; Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
  • Xiong YM; School of Physics, University of Chinese Academy of Sciences, Beijing 100190, China.
  • Xu G; Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China.
  • Wulfhekel W; Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
  • Mesot J; Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
  • Reticcioli M; Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
  • Franchini C; Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, Anhui 230031, China.
  • Mudry C; University of Science and Technology of China, Hefei, Anhui 230026, China.
  • Müller M; Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, Anhui 230031, China.
  • Shi YG; Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
  • Qian T; Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.
  • Ding H; Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany.
  • Shi M; Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
Sci Adv ; 5(7): eaaw4718, 2019 Jul.
Article in En | MEDLINE | ID: mdl-31309151
ABSTRACT
Weyl fermions as emergent quasiparticles can arise in Weyl semimetals (WSMs) in which the energy bands are nondegenerate, resulting from inversion or time-reversal symmetry breaking. Nevertheless, experimental evidence for magnetically induced WSMs is scarce. Here, using photoemission spectroscopy, we observe that the degeneracy of Bloch bands is already lifted in the paramagnetic phase of EuCd2As2. We attribute this effect to the itinerant electrons experiencing quasi-static and quasi-long-range ferromagnetic fluctuations. Moreover, the spin-nondegenerate band structure harbors a pair of ideal Weyl nodes near the Fermi level. Hence, we show that long-range magnetic order and the spontaneous breaking of time-reversal symmetry are not essential requirements for WSM states in centrosymmetric systems and that WSM states can emerge in a wider range of condensed matter systems than previously thought.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Sci Adv Year: 2019 Document type: Article Affiliation country: Suiza
Fulltext
Add to My VHL
Print
XML
PubMed Links
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Sci Adv Year: 2019 Document type: Article Affiliation country: Suiza