Chiral superconductivity in UTe₂ probed by anisotropic low-energy excitations.

ABSTRACT: Chiral spin-triplet superconductivity is a topologically nontrivial pairing state with broken time-reversal symmetry, which can host Majorana quasiparticles. The heavy-fermion superconductor UTe₂ exhibits peculiar properties of spin-triplet pairing, and the possible chiral state has been actively discussed. However, the symmetry and nodal structure of its order parameter in the bulk, which determine the Majorana surface states, remains controversial. Here we focus on the number and positions of superconducting gap nodes in the ground state of UTe₂. Our magnetic penetration depth measurements for three field orientations in three crystals all show the power-law temperature dependence with exponents close to 2, which excludes single-component spin-triplet states. The an

SUBMITTER: Ishihara K 

PROVIDER: S-EPMC10205722 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature