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The magnetic penetration depth as a function of temperature in Bi4O4S3 wasstudied by muon-spin-spectroscopy measurements. The superfluid density ofBi4O4S3 is found to be very low. The dependence of penetration depth ontemperature possibly suggests the existence of two s-wave type energy gaps withthe zero-temperature values of 0.93(3) and 0.09(4) meV. The upturn in thetemperature dependence of the upper critical field close to Tc further supportsmulti-gap superconductivity in Bi4O4S3. The presence of two superconductingenergy gaps is consistent with theoretical and other experimental studies.However, a single-gap s-wave model fit with a gap of 0.88(2) meV can not beruled out completely. The value of penetration depth at T = 0 K is estimated tobe of 861(17) nm, one of the largest of all known layered superconductors,reflecting a very low superfluid density.

Low superfluid density and possible multi-gap superconductivity in BiS2-based layered superconductor Bi4O4S3