Two-band superconductivity featuring different anisotropies in the ternary iron silicide Lu${}_2$Fe${}_3$Si${}_5$

Abstract

We report detailed studies of the upper critical field and low-temperature specific heat in the two-gap superconductor Lu${}_2$Fe${}_3$Si${}_5$. The anisotropy of the upper critical field suggests that the active band is quasi-one-dimensional. Low-temperature specific heat in magnetic fields reveals that the virtual $H_{c2}$ in the passive band is almost isotropic. These results strongly indicate that the two bands have two different anisotropies, similar to the typical two-gap superconductor MgB${}_2$, and their interplay may be essential to the two-gap superconductivity in Lu${}_2$Fe${}_3$Si${}_5$.

arXiv comment5 pages, 5 figures

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