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Evidence for an odd-parity nematic phase above the charge-density-wave transition in a kagome metal

Journal Article · · Nature Physics
 [1];  [2];  [2];  [1];  [1];  [1];  [1];  [1];  [1];  [3];  [2];  [4];  [5];  [6];  [7];  [8];  [8];  [2];  [1]
  1. Kyoto University (Japan)
  2. University of Tokyo, Chiba (Japan)
  3. Kyoto University (Japan); RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)
  4. Nagoya University, Furo-cho (Japan); Kyoto University (Japan)
  5. Nagoya University, Furo-cho (Japan)
  6. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  7. University of California, Santa Barbara, CA (United States)
  8. Nanjing University (China)
+ Show Author Affiliations

The search for quantum states arising from the interplay between correlation, frustration and topology is a central topic for condensed-matter physics. Recently discovered non-magnetic kagome metals AV3Sb5 (A = K, Cs or Rb) with charge-density-wave and superconducting instabilities may host such exotic states. Here we report evidence that an odd-parity electronic nematic state emerges at a higher temperature than the charge density wave in CsV3Sb5. Our torque measurements reveal a two-fold in-plane magnetic anisotropy that breaks the crystal rotational symmetry. Moreover, in the temperature range between the formation of the charge density wave and a nematic state, rotating an external magnetic field in a conical fashion yields a distinct first-order phase transition, indicating time-reversal symmetry breaking. These results provide thermodynamic evidence for the emergence of an odd-parity nematic order. In addition, elastoresistance shows no discernible anomalies near the onset of nematicity, consistent with the odd-parity order. In conclusion, these findings suggest that an exotic loop current state precedes the charge-density-wave transition in CsV3Sb5.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); Japan Science and Technology (JST); Japan Society for the Promotion of Science (JSPS); National Science Foundation (NSF)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2282940
Journal Information:
Nature Physics, Journal Name: Nature Physics Journal Issue: 1 Vol. 20; ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)Copyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (4)

FIG. 1(p. 13)figure FIG. 1
FIG. 2(p. 19)figure FIG. 2
FIG. 3(p. 20)figure FIG. 3
FIG. 4(p. 21)figure FIG. 4

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36 MATERIALS SCIENCE