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Superconducting properties of MgCu2-type Laves phase compounds SrRh2 and BaRh2
Chunsheng Gong1, Qi Wang1, Shaohua Wang1
1Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, People's Republic of China.
Abstract:
We report a systematic study on the superconducting properties of MgCu2-type Laves phase compounds SrRh2 and BaRh2. SrRh2 and BaRh2 exhibit superconducting transitions atT c = 5.4 K and 5.6 K, respectively. The zero-temperature upper critical field μ 0 H c2(0) and lower critical field μ 0 H c1(0) are estimated to be 4.01(5) T and 10.1(3) mT for SrRh2, when both values are 4.63(5) T and 5.3(1) mT for BaRh2, indicating that they are type-II superconductors. The large specific heat jump combined with the strong electron-phonon coupling strength λ e-ph suggests that they are intermediately coupled BCS bulk superconductors.
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