Probing orbital magnetism of a kagome metal CsV<sub>3</sub>Sb<sub>5</sub> by a tuning fork resonator.
basic_science · Level V
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- Record sourced from PubMed, PMID 40341014.
- Also identified by DOI 10.1038/s41467-025-59534-3 and PMC identifier 12062287.
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Abstract
The recently discovered kagome metal CsV<sub>3</sub>Sb<sub>5</sub> exhibits a complex phase diagram that encompasses frustrated magnetism, topological charge density wave (CDW), and superconductivity. One CDW state that breaks time-reversal symmetry was proposed in this compound, while the exact nature of the putative magnetic state remains elusive. To examine the thermodynamic state of CsV<sub>3</sub>Sb<sub>5</sub> and assess the character of the associated magnetism, we conducted tuning fork resonator measurements of magnetotropic susceptibility over a broad range of angles, magnetic fields, and temperatures. We found a cascade of phase transitions in the CDW phase. Of particular interest is a highly anisotropic magnetic structure that arises below about 30 K, with a magnetic moment along the c-axis that has an extremely small magnitude. This magnetic state demonstrates extremely slow dynamics and small saturate field, all suggest that electronic phase below 30 K breaks time reversal symmetry and has an unconventional origin.