Thermal Hall measurements to detect spontaneous thermal Hall effect in kagome superconductor CsV₃Sb₅

Chiral superconductivity, breaking time-reversal symmetry, has attracted attentions as a topological superconductor characterized by bulk quasiparticle bands with non-trivial topological numbers. Whereas some candidates of chiral superconductors are suggested mainly by µSR and Kerr effect measurements, verification by bulk measurements is required. A prominent feature can be used to confirm chiral superconductivity is to investigate the appearance of the spontaneous thermal Hall effect at the zero field at the superconducting transition. In this talk, I shall introduce our trials to detect the spontaneous thermal Hall effect in the kagome superconductor CsV₃Sb₅.