Superconductivity in the Mn5Si3-type Zr5Sb3 system
B. Lv (1), X. Y. Zhu (1), B. Lorenz (1), F. Y. Wei (1), Y. Y. Xue (1),, Z. P. Yin (2), G. Kotliar (2), and C. W. Chu (1, 3) ((1) Texas Center for, Superconductivity, Department of Physics, University of Houston, Houston,, Texas, USA, (2) Department of Physics, Astronomy
TL;DR
This paper reports the discovery of superconductivity at 2.3 K in Zr5Sb3, the first in its structural family, highlighting its phonon-mediated BCS nature and suggesting potential for higher transition temperatures in related compounds.
Contribution
It is the first identification of superconductivity in the Mn5Si3-type Zr5Sb3 system, expanding the known family of superconducting materials with this structure.
Findings
Superconductivity at 2.3 K in Zr5Sb3
Zr5Sb3 is a phonon-mediated BCS superconductor
Higher transition temperatures may be achievable in this family
Abstract
We report the discovery of superconductivity at 2.3 K in Zr5Sb3, the first superconducting member in the large compound family of the Mn5Si3-structure type. Transport, magnetic, and calorimetric measurements and band structure calculations show it to be a phonon-mediated BCS superconductor, with a relatively large density of states at the Fermi level associated with the d-electrons of Zr and substantially larger electron-phonon coupling compared to the Sn counterpart compound Zr5Sn3. More superconductors with even higher transition temperatures are expected to be found in this family of compounds.
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