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

Bhattacharyya, A and Panda, K and Adroja, D T and Kase, N and Biswas, P K and Saha, Surabhi and Das, Tanmoy and Lees, M R and Hillier, A D (2020) Investigation of superconducting gap structure in HfIrSi using muon spin relaxation/rotation. In: JOURNAL OF PHYSICS-CONDENSED MATTER, 32 (8).

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Official URL: https://dx.doi.org/10.1088/1361-648X/ab549e


We have investigated the superconducting state of HfIrSi using magnetization, specific heat, muon spin rotation and relaxation (SR) measurements. Superconductivity was observed at K in both specific heat and magnetization measurements. From an analysis of the transverse-field 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 m(?3), the magnetic penetration depth, nm, and the effective mass, , were calculated from the TF-SR data. Zero-field SR data for HfIrSi reveal the absence of any spontaneous magnetic moments below , 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.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to IOP PUBLISHING LTD
Keywords: ternary equiatomic superconductor; superconducting gap structure; muon spin spectroscopy
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 01 Jan 2020 10:09
Last Modified: 01 Jan 2020 10:09
URI: http://eprints.iisc.ac.in/id/eprint/64184

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