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Investigation of superconducting gap structure in HfIrSi using muon spin relaxation/rotation.

Authors
  • Bhattacharyya, A1
  • Panda, K
  • Adroja, D T
  • Kase, N
  • Biswas, P K
  • Saha, Surabhi
  • Das, Tanmoy
  • Lees, M R
  • Hillier, A D
  • 1 Department of Physics, Ramakrishna Mission Vivekananda Educational and Research Institute, Howrah 711202, West Bengal, India. , (India)
Type
Published Article
Journal
Journal of Physics Condensed Matter
Publisher
IOP Publishing
Publication Date
Feb 20, 2020
Volume
32
Issue
8
Pages
85601–85601
Identifiers
DOI: 10.1088/1361-648X/ab549e
PMID: 31689696
Source
Medline
Language
English
License
Unknown

Abstract

We have investigated the superconducting state of HfIrSi using magnetization, specific heat, muon spin rotation and relaxation ([Formula: see text]SR) measurements. Superconductivity was observed at [Formula: see text] K in both specific heat and magnetization measurements. From an analysis of the transverse-field [Formula: see text]SR data, it is clear that the temperature variation of superfluid density is well fitted by an isotropic Bardeen-Cooper-Schrieffer (BCS) type s-wave gap structure. The superconducting carrier density [Formula: see text] m-3, the magnetic penetration depth, [Formula: see text] nm, and the effective mass, [Formula: see text], were calculated from the TF-[Formula: see text]SR data. Zero-field [Formula: see text]SR data for HfIrSi reveal the absence of any spontaneous magnetic moments below [Formula: see text], indicating that time-reversal symmetry (TRS) is preserved in the superconducting state of HfIrSi. Theoretical investigations suggest that the Hf and Ir atoms hybridize strongly along the c-axis, and that this is responsible for the strong three-dimensionality of this system which screens the Coulomb interaction. As a result, despite the presence of d-electrons in HfIrSi, these correlation effects are weakened, making the electron-phonon coupling more important.

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