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Physical properties of noncentrosymmetric superconductor LaIrSi3: A μSR study

Anand, VK; Britz, D; Bhattacharyya, A; Adroja, DT; Hillier, AD; Strydom, AM; Kockelmann, W; ... McEwen, KA; + view all (2014) Physical properties of noncentrosymmetric superconductor LaIrSi3: A μSR study. Physical Review B , 90 , Article 014513 . 10.1103/PhysRevB.90.014513. Green open access

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Abstract

The results of heat capacity C_p(T, H) and electrical resistivity \rho(T,H) measurements down to 0.35 K as well as muon spin relaxation and rotation (\muSR) measurements on a noncentrosymmetric superconductor LaIrSi3 are presented. Powder neutron diffraction confirmed the reported noncentrosymmetric body-centered tetragonal BaNiSn3-type structure (space group I4\,mm) of LaIrSi3. The bulk superconductivity is observed below T_c = 0.72(1) K. The intrinsic \Delta C_e/\gamma_n T_c = 1.09(3) is significantly smaller than the BCS value of 1.43, and this reduction is accounted by the \alpha-model of BCS superconductivity. The analysis of the superconducting state C_e(T) data by the single-band \alpha-model indicates a moderately anisotropic order parameter with the s-wave gap \Delta(0)/k_B T_c = 1.54(2) which is lower than the BCS value of 1.764. Our estimates of various normal and superconducting state parameters indicate a weakly coupled electron-phonon driven type-I s-wave superconductivity in LaIrSi3. The \muSR results also confirm the conventional type-I superconductivity in LaIrSi3 with a preserved time reversal symmetry and hence a singlet pairing superconducting ground state.

Type: Article
Title: Physical properties of noncentrosymmetric superconductor LaIrSi3: A μSR study
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.90.014513
Publisher version: http://dx.doi.org/10.1103/PhysRevB.90.014513
Language: English
Additional information: ©2014 American Physical Society 11 pages, 8 figures, 2 tables
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: http://discovery.ucl.ac.uk/id/eprint/1437233
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