Eur. Phys. J. B (2018) 91: 56
https://doi.org/10.1140/epjb/e2018-80714-8

Regular Article

Superconducting properties of molybdenum ruthenium alloy Mo_0.63Ru_0.37

¹ Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Heifei 230026, P.R. China
² Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of Chinese Academy of Sciences, Hefei 230031, P.R. China
³ Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, P.R. China

^a e-mail: duhf@hmfl.ac.cn

Received: 19 December 2017
Received in final form: 2 February 2018
Published online: 29 March 2018

Abstract

Resistance, magnetization and specific heat measurements were performed on Mo_0.63Ru_0.37 alloy. All of them confirm that Mo_0.63Ru_0.37 becomes superconducting at about 7.0 K with bulk nature. Its upper critical field behavior fits to Werthamer-Helfand-Hohenberg (WHH) model quite well, with an upper critical field of μ₀H_c2(0) = 8.64 T, less than its Pauli limit. Its electronic specific heat is reproduced by Bardeen-Cooper-Schriffer (BCS)-based α-model with a gap ratio Δ₀ = 1.88k_BT_c, which is a little larger than the standard BCS value of 1.76. We concluded that Mo_0.63Ru_0.37 is a fully gapped isotropic s-wave superconductor, with its features are mostly consistent with the conventional theory.