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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Abstract

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
Publication:	JOURNAL OF PHYSICS-CONDENSED MATTER
Publisher:	IOP PUBLISHING LTD
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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