Anomalous Phonon in Charge-Density-Wave Phase of Kagome Metal CsV3Sb5
arxiv(2024)
摘要
CsV3Sb5, a notable compound within the kagome family, is renowned for its
topological and superconducting properties, as well as its detection of local
magnetic field and anomalous Hall effect in experiments. However, the origin of
this local magnetic field is still veiled. In this study, we employ the
first-principles calculations to investigate the atomic vibration in both the
pristine and the charge-density-wave phases of CsV_3Sb_5. Our analysis
reveals the presence of “anomalous phonons" in these structures, these phonon
induce the circular vibration of atoms, contributing to the phonon magnetic
moments and subsequently to the observed the local magnetic fields.
Additionally, we observe that lattice distortion in the charge-density-wave
phase amplifies these circular vibrations, resulting in a stronger local
magnetic field, particularly from the vanadium atoms. This investigation not
only reveals the potential relation between lattice distortion and atomic
polarization but also offers a novel idea to understand the origin of local
magnetic moment in CsV3Sb5.
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