Year: 2019
Type: article
Abstract: Topological nonsymmorphic crystalline superconductivity (TNCS) is an intriguing phase of matter, offering a platform to study the interplay between topology, superconductivity, and nonsymmorphic crystalline symmetries. Interestingly, some of TNCSs are classified into Z_{4} topological phases, which have unique surface states referred to as a Möbius strip or an hourglass, and they have not been achieved in symmorphic superconductors. However, material realization of Z_{4} TNCS has never been known, to the best of our knowledge. Here, we propose that the paramagnetic superconducting phase of UCoGe under pressure is a promising candidate of Z_{4}-nontrivial TNCS enriched by glide symmetry. We evaluate Z_{4} invariants of UCoGe by deriving the formulas relating Z_{4} invariants to the topology of Fermi surfaces. Applying the formulas and previous ab initio calculations, we clarify that three odd-parity representations out of four are Z_{4}-nontrivial TNCS, whereas the other is also Z_{2}-nontrivial TNCS. We also discuss possible Z_{4} TNCS in CrAs and related materials.
Source: Physical Review Letters
Authors: Akito Daido, Tsuneya Yoshida, Youichi Yanase
Institutions: Kyoto University, University of Tsukuba
Language: Latvian
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G2369834278, 強相関電子系における物質相としてのトポロジカル超伝導, Magnetism, multipole order, and superconductivity in locally noncentrosymmetric crystals, Non-Hermitian topological phenomena induced by strong correlations, Theoretical study towards establishing odd-parity multiple materials science: classification, electromagnetic responses, superconductivity, Understanding of the Mechanism of Superconductivity and Search for a Novel Superconducting State in Uranium Heavy-Fermion Compounds, G5325044368, G6875682753, Rotational symmetry breaking in strongly correlated quantum matters
OpenAlex ID: W2948687477