2021/02/18 by David Möckli, Aline Ramires · 3 citations
Materials Science · Physics and Astronomy · #Coupling (piping) #Fermion #Iron-based superconductors research #Magnetic field #Pairing #Phase (matter) #Phase diagram #Phase transition #Rare-earth and actinide compounds #Superconductivity #Topological Materials and Phenomena #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevresearch.3.023204
published as Phys. Rev. Research 3, 023204 (2021) · 5 pages, 2 figures, 4 tables
arxiv created 2021/02/18 · openalex created_date 2021/03/01 · openalex publication_date 2021/06/11 · arxiv updated 2021/06/14 · openalex updated_date 2026/08/05
CeRh 2 As 2 , a nonsymmorphic heavy fermion material, was recently reported to host a remarkable temperature versus z-axis magnetic-field phase diagram with two superconducting phases. In this material, the two inequivalent Ce sites per unit cell, related by inversion symmetry, introduce a sublattice structure corresponding to an extra internal degree of freedom. Here we propose a classification of the possible superconducting states in CeRh 2 As 2 from the two Ce-sites' perspective. Based on the superconducting fitness analysis and the quasiclassical Eilenberger equations, we discuss two limits: Rashba spin-orbit coupling and interlayer hopping dominated normal state. In both limits, we are able to find two scenarios that generate phase diagrams in qualitative agreement with experiments: (i) intrasublattice pairing with an even-odd transition under z-axis magnetic field and (ii) intersublattice pairing with an odd-odd transition under z-axis magnetic field.