Zr$_5$Sb$_3$$_-$$_x$Ru$_x$, a new superconductor in the W$_5$Si$_3$ structure type

Weiwei Xie; Huixia Luo; Brendan F. Phelan; Robert J. Cava

paper

Zr $_{5}$ Sb $_{3}$ $_{-}$ $_{x}$ Ru $_{x}$ , a new superconductor in the W $_{5}$ Si $_{3}$ structure type

arXiv:1508.01234

Abstract

We report that at low Ru contents, up to x = 0.2, the Zr $_{5}$ Sb $_{3}$ $_{-}$ $_{x}$ Ru $_{x}$ solid solution forms in the hexagonal Mn $_{5}$ Si $_{3}$ structure type of the host (x = 0), but that at higher Ru contents (x = 0.4 - 0.6) the solid solution transforms into the tetragonal W $_{5}$ Si $_{3}$ structure type. We find that tetragonal Zr $_{5}$ Sb $_{2}$ $_{.}$ $_{4}$ Ru $_{0}$ $_{.}$ $_{6}$ is superconducting at 5 K, significantly higher than the transition temperature of hexagonal Zr $_{5}$ Sb $_{3}$ (x = 0), which has a T $_{c}$ of 2.3 K. In support of a hypothesis that certain structure types are favorable for superconductivity, we describe how the W $_{5}$ Si $_{3}$ and Tl $_{5}$ Te $_{3}$ structure types, both of which support superconductivity, are derived from the parent Al $_{2}$ Cu type structure, in which superconductors are also found. Electronic structure calculations show that in Zr $_{1}$ $_{0}$ Sb $_{5}$ Ru, a model for the new superconducting compound, the Fermi level is located on a peak in the electronic density of states.

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Zr5​Sb3​−​x​Rux​, a new superconductor in the W5​Si3​ structure type

Abstract

Cited by in corpus (1)

Zr $_{5}$ Sb $_{3}$ $_{-}$ $_{x}$ Ru $_{x}$ , a new superconductor in the W $_{5}$ Si $_{3}$ structure type