Synthesis and Characterization of the Superconductor Mo3Sb7 |
| V.H. Tran
W. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław, Poland and Z. Bukowski Laboratory for Solid State Physics, ETH Zűrich, 8093 Zűrich, Switzerland |
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| Received: 6 11 2007; |
| We synthesized a polycrystalline sample of the superconductor Mo3Sb7 and characterized its basic properties by measurements of magnetization, electrical resistivity and specific heat. The measurements establish a superconducting phase transition at Tc=2.25 (0.05) K. In applied magnetic fields, the magnetization and resistivity show the behavior of type-II superconductor. From the specific heat measurement, the electronic specific heat coefficient,γ, specific heat jump at Tc, ΔC(Tc)/γTc, and the Debye temperature ΘD, are evaluated to be 34.5 mJ/(mol K2), 1.56 and 283 K, respectively. From analysis of the specific heat data we suggest that this compound belongs to an intermediate strong coupling regime in the BCS context. The observed enhancement in the γ-value suggests a substantial contribution of Mo-4d-electrons to the density of states. Our experimental data do not support interpretation of superconductivity in Mo3Sb7 in terms of neither unconventional superconductivity or spin fluctuations proposed previously. |
| DOI: 10.12693/APhysPolA.114.67 PACS numbers: 74.25.Bt, 74.70.-b |