三元铁硅化物Lu $_{2}$ Fe $_{3}$ Si $_{5}$中具有不同各向异性的双带超导电性
Two-band superconductivity featuring different anisotropies in the ternary iron silicide Lu$_{2}$Fe$_{3}$Si$_{5}$
摘要：
本文详细研究了双能隙超导体Lu $_{2}$ Fe $_{3}$ Si $_{5}$的上临界场和低温比热。上临界场的各向异性表明，激活带是准一维的。磁场中的低温比热表明，被动带中的虚$H_{c2}$几乎是各向同性的。这些结果强烈地表明，这两个能带具有两种不同的各向异性，类似于典型的双能隙超导体MgB $_{2}$，它们的相互作用可能是Lu $_{2}$ Fe $_{3}$ Si $_{5}$中双能隙超导性的关键.
英文摘要：
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$_{5}$.
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