Physical properties of noncentrosymmetric superconductor LaIrSi3: A μSR 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

doi:10.1103/PhysRevB.90.014513

Physical properties of noncentrosymmetric superconductor LaIrSi3: A μSR 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

DOI 10.1103/PhysRevB.90.014513 · Physical Review B

T1

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Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LaIrSi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.72	Pressure unresolved	midpoint
LaIrSi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.45	Pressure unresolved	midpoint
LaIrSi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.72	Pressure unresolved	unknown
CePt3Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.75	Pressure not reported	unknown
BaPtSi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.25	Pressure unresolved	unknown
LaRhSi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.16	Pressure unresolved	unknown
CaIrSi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.6	Pressure unresolved	unknown
CaPtSi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.3	Pressure unresolved	unknown
LaPdSi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.65	Pressure unresolved	unknown
LaPtSi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.52	Pressure unresolved	unknown