Physical properties of noncentrosymmetric superconductor LaIrSi3: A μ SR study

V. K. Anand, D. Britz, A. Bhattacharyya, D. T. Adroja, A. D. Hillier, A. M. Strydom, W. Kockelmann, B. D. Rainford, K. A. McEwen

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The results of heat capacity Cp(T,H) and electrical resistivity ρ(T,H) measurements down to 0.35 K as well as muon spin relaxation and rotation (μSR) measurements on the noncentrosymmetric superconductor LaIrSi3 are presented. Powder neutron diffraction confirmed the reported noncentrosymmetric body-centered tetragonal BaNiSn3-type structure (space group I4mm) of LaIrSi3. The bulk superconductivity is observed below Tc=0.72(1) K. The intrinsic ΔCe/γnTc=1.09(3) is significantly smaller than the BCS value of 1.43, and this reduction is accounted for by the α model of BCS superconductivity. The analysis of the superconducting-state Ce(T) data by the single-band α model indicates a moderately anisotropic order parameter with the s-wave gap Δ(0)/kBTc=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 μSR results also confirm the conventional type-I superconductivity in LaIrSi3 with a preserved time-reversal symmetry and hence a singlet pairing superconducting ground state.

Original languageEnglish
Article number014513
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number1
Publication statusPublished - 23 Jul 2014

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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