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Evidence of a hidden flux phase in the topological kagome metal CsV$_3$Sb$_5$

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arxiv 2107.10714 v1 pith:5VZZANTP submitted 2021-07-22 cond-mat.supr-con cond-mat.str-el

Li Yu , Chennan Wang , Yuhang Zhang , Mathias Sander , Shunli Ni , Zouyouwei Lu , Sheng Ma , Zhengguo Wang
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Zhen Zhao Hui Chen Kun Jiang Yan Zhang Haitao Yang Fang Zhou Xiaoli Dong Steven L. Johnson Michael J. Graf Jiangping Hu Hong-Jun Gao Zhongxian Zhao
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classification cond-mat.supr-concond-mat.str-el
keywords phasetrsbkagomestatesymmetrybelowexperimentalflux
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abstract

Phase transitions governed by spontaneous time reversal symmetry breaking (TRSB) have long been sought in many quantum systems, including materials with anomalous Hall effect (AHE), cuprate high temperature superconductors, Iridates and so on. However, experimentally identifying such a phase transition is extremely challenging because the transition is hidden from many experimental probes. Here, using zero-field muon spin relaxation (ZF-$\mu$SR) technique, we observe strong TRSB signals below 70 K in the newly discovered kagome superconductor CsV$_3$Sb$_5$. The TRSB state emerges from the 2 x 2 charge density wave (CDW) phase present below ~ 95 K. By carrying out optical second-harmonic generation (SHG) experiments, we also find that inversion symmetry is maintained in the temperature range of interest. Combining all the experimental results and symmetry constraints, we conclude that the interlayer coupled chiral flux phase (CFP) is the most promising candidate for the TRSB state among all theoretical proposals of orbital current orders. Thus, this prototypical kagome metal CsV3Sb5 can be a platform to establish a TRSB current-ordered state and explore its relationship with CDW, giant AHE, and superconductivity.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 90 citations worldwide. Full citation record

  1. Symmetry-broken ground state and phonon mediated superconductivity in Kagome CsV$_3$Sb$_5$

    cond-mat.mtrl-sci 2025-05 conditional novelty 7.0 of 10

    The CDW ground state of the kagome superconductor CsV3Sb5 is a pair of nearly degenerate π-TrH and 4TrH triangular-hexagonal stackings, and its superconductivity is phonon-mediated with Tc around 2.7 K.

  2. Orbital altermagnetism on the kagome lattice and possible application to $A$V$_3$Sb$_5$

    cond-mat.str-el 2025-09 conditional novelty 6.0 of 10

    On an odd-sublattice kagome lattice, non-uniform collinear orbital moments from CDW/loop-current order can form a d-wave altermagnet with spin-split bands, as possibly realized in AV3Sb5.

  3. Revealing the orbital origins of exotic electronic states with Ti substitution in kagome superconductor CsV3Sb5

    cond-mat.supr-con 2025-02 conditional novelty 6.0 of 10

    Ti doping of CsV3Sb5 suppresses V out-of-plane orbital QPI while leaving in-plane V orbitals intact, and Sb pz QPI vanishes inside the pseudogap and superconducting gap, revealing orbital-specific roles in the cascade...

  4. Topological in-gap chiral edge states in superconducting Haldane model with spin-orbit coupling

    cond-mat.supr-con 2025-07 conditional novelty 5.0 of 10

    In the Haldane model with s-wave pairing, Rashba spin-orbit coupling moves chiral edge states inside the superconducting gap and can produce a gapless topological superconducting phase.

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