Physical properties of noncentrosymmetric superconductor LaIrSi3: A μSR study
Abstract
The results of heat capacity Cp(T, H) and electrical resistivity (T,H) measurements down to 0.35 K as well as muon spin relaxation and rotation (μSR) 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 Tc = 0.72(1) K. The intrinsic Ce/γn Tc = 1.09(3) is significantly smaller than the BCS value of 1.43, and this reduction is accounted 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 (0)/kB Tc = 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.
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