Fully-gapped superconductivity with rotational symmetry breaking in pressurized kagome metal CsV₃Sb₅.

ABSTRACT: The discovery of the kagome metal CsV₃Sb₅ has generated significant interest in its complex physical properties, particularly its superconducting behavior under different pressures, though its nature remains debated. Here, we performed low-temperature, high-pressure ^121/123Sb nuclear quadrupole resonance (NQR) measurements to explore the superconducting pairing symmetry in CsV₃Sb₅. At ambient pressure, we found that the spin-lattice relaxation rate 1/T₁ exhibits a kink at T ~ 0.4 T_c within the superconducting state and follows a T³ variation as temperature further decreases. This suggests the presence of two superconducting gaps with line nodes in the smaller one. As pressure increases beyond P_c

SUBMITTER: Feng XY 

PROVIDER: S-EPMC12003820 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature