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Evidence of a Nodal Line in the Superconducting Gap Symmetry of Noncentrosymmetric

Amitava Bhattacharyya A. D HILLIER; P Manfrinetti; Devashibhai Adroja; Kartik Panda; SURABHI SAHA; TANMOY DAS; Antonio Jefferson da Silva Machado; O. V Cigarroa; T. W Grant; Z Fisk

Physical review letters v. 122, p.147001-147001-4, 2019

2019

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  • Título:
    Evidence of a Nodal Line in the Superconducting Gap Symmetry of Noncentrosymmetric
  • Autor: Amitava Bhattacharyya
  • A. D HILLIER; P Manfrinetti; Devashibhai Adroja; Kartik Panda; SURABHI SAHA; TANMOY DAS; Antonio Jefferson da Silva Machado; O. V Cigarroa; T. W Grant; Z Fisk
  • Assuntos: SUPERCONDUTIVIDADE; FÍSICA DA MATÉRIA CONDENSADA
  • É parte de: Physical review letters v. 122, p.147001-147001-4, 2019
  • Notas: Disponível em: https://doi.org/10.1103/PhysRevLett.122.147001. Acesso em: 26 mai. 2022.
  • Descrição: The newly discovered noncentrosymmetric superconductor ThCoC 2 exhibits numerous types of unconventional behavior in the field dependent heat capacity data. Here we present the first measurement of the gap symmetry of ThCoC 2 by muon spin rotation and relaxation ( μ SR ) measurements. The temperature dependence of the magnetic penetration depth measured using the transverse field μ SR experiment reveals the evidence of a nodal pairing symmetry. To understand this finding, we carry out calculations of the superconducting pairing eigenvalue and eigenfunction (pairing symmetry) due to the spin-fluctuation mechanism by directly implementing the ab initio band structures. We find that the system possesses a single Fermi surface with considerable three dimensionality and a strong nesting along the k z direction. Such nesting promotes a superconducting state with a cos k z -like pairing symmetry with a prominent nodal line on the k z = ± π / 2 plane. The result agrees well with the experimental data.
  • Data de criação/publicação: 2019
  • Formato: p. 147001-147001-4.
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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