Nuclear spin-lattice relaxation rate in noncentrosymmetric superconductor Y₂C₃

2016/08/03 by Chongju Chen, Biao Jin, Chen, Chongju +1
Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Superconductivity (cond-mat.supr-con)

paper · pdf · doi:10.48550/arxiv.1608.01190

openalex publication_date 2016/08/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

For a noncentrosymmetric superconductor such as Y₂C₃, we consider a parity-mixing model composed of spin-singlet s-wave and spin-triplet f-wave pairing components. The d-vector in f-wave state is chosen to be parallel to the Dresselhaus asymmetric spin-orbit coupling vector. It is found that, the quasiparticle excitation spectrum exhibits distinct nodal structure as a consequence of parity-mixing. Our calculation predict anomalous noninteger power laws for low-temperature nuclear spin-lattice relaxation rate T₁^-1. We demonstrate particularly that such a model can qualitatively account for the existing experimental results of the temperature dependence of T₁^-1 in Y₂C₃.

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