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

TL;DR

This study investigates the superconducting properties of Lu2Fe3Si5, revealing evidence of two-gap s+s-wave superconductivity through muon spin rotation and specific heat measurements, indicating complex pairing mechanisms.

Contribution

First demonstration of two-gap superconductivity in Lu2Fe3Si5 using muon spin rotation and specific heat data, providing new insights into its pairing symmetry.

Findings

Magnetic penetration depth of 353 nm at zero temperature.

Temperature dependence consistent with two-gap s+s-wave model.

Evidence of two distinct superconducting gaps from specific heat measurements.

Abstract

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.