Specific heat evidence for two-gap superconductivity in ternary-iron silicide Lu$ {2}$Fe$ {3}$Si$ {5}$ - Condensed Matter > SuperconductivityReportar como inadecuado




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Abstract: We report low-temperature specific heat studies on single-crystallineternary-iron silicide superconductor Lu$ {2}$Fe$ {3}$Si$ {5}$ with$T c$ = 6.1 Kdown 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 $C-T$ showssudden drop at $\sim T c-5$ and goes to zero with further decreasingtemperature. These results indicate the presence of two distinctsuperconducting gaps in Lu$ {2}$Fe$ {3}$Si$ {5}$, similar to a typical two-gapsuperconductor MgB$ {2}$. We also report Hall coefficients, band structurecalculation, and the anisotropy of upper critical fields forLu$ {2}$Fe$ {3}$Si$ {5}$, which support the anisotropic multiband nature andreinforce the existence of two superconducting gaps inLu$ {2}$Fe$ {3}$Si$ {5}$.



Autor: Y. Nakajima, T. Nakagawa, T. Tamegai, H. Harima

Fuente: https://arxiv.org/



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