Two-gap superconductivity in Lu${}_2$Fe${}_3$Si${}_5$: a transverse-field muon spin rotation study

The superconducting properties of Lu2Fe3Si5 with Tc = 6.1 K have been investigated using low-temperature transverse-field muon spin rotation ($\mu$SR) and specific heat measurements. The magnetic penetration depth at zero temperature is 353(1) nm. However, the temperature dependence of the magnetic penetration depth is consistent with a two gap s+s-wave model. Low-temperature specific heat measurements on the same sample also show evidence of two distinct superconducting gaps.