Specific heat evidence for two-gap superconductivity in ternary-iron silicide Lu$_{2}$Fe$_{3}$Si$_{5}$

Y. Nakajima; T. Nakagawa; T. Tamegai; H. Harima

doi:10.1103/PhysRevLett.100.157001

paper

Specific heat evidence for two-gap superconductivity in ternary-iron silicide Lu $_{2}$ Fe $_{3}$ Si $_{5}$

arXiv:0801.0111 · doi:10.1103/PhysRevLett.100.157001

Abstract

We report low-temperature specific heat studies on single-crystalline ternary-iron silicide superconductor Lu $_{2}$ Fe $_{3}$ Si $_{5}$ with $T_{c}$ = 6.1 K down to $\sim T_{c} /20$ . We confirm a reduced normalized jump in specific heat at $T_{c}$ , and find that the specific heat divided by temperature $C / T$ shows sudden drop at $\sim T_{c} /5$ and goes to zero with further decreasing temperature. These results indicate the presence of two distinct superconducting gaps in Lu $_{2}$ Fe $_{3}$ Si $_{5}$ , similar to a typical two-gap superconductor MgB $_{2}$ . We also report Hall coefficients, band structure calculation, and the anisotropy of upper critical fields for Lu $_{2}$ Fe $_{3}$ Si $_{5}$ , which support the anisotropic multiband nature and reinforce the existence of two superconducting gaps in Lu $_{2}$ Fe $_{3}$ Si $_{5}$ .

5 pages, 5 figures

Specific heat evidence for two-gap superconductivity in ternary-iron silicide Lu $_{2}$ Fe $_{3}$ Si $_{5}$

Abstract

References in corpus (10)

Cited by in corpus (43)

Specific heat evidence for two-gap superconductivity in ternary-iron silicide Lu2​Fe3​Si5​

Abstract

References in corpus (10)

Cited by in corpus (43)

Specific heat evidence for two-gap superconductivity in ternary-iron silicide Lu $_{2}$ Fe $_{3}$ Si $_{5}$