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We report the synthesis and measurements of magnetic, transport, and thermal properties of polycrystalline Nb0.18Re0.82, which has a superconducting transition at Tc ∼ 8.8 K. The noncentrosymmetric α-Mn structure of the compound is confirmed by x-ray diffraction. Using the measured values for the lower critical field H c1, upper critical field Hc2, and the specific heat C, we estimate the thermodynamic critical field Hc(0), coherence length ξ(0), penetration depth λ(0), and the Ginzburg-Landau parameter κ(0). The specific heat jump at Tc, ΔC/γT c = 1.86, suggests that Nb0.18Re0.82 is a moderately coupled superconductor. Below Tc the electronic specific heat decays exponentially, suggesting that the gap is isotropic. Our data suggest that the triplet admixture is weak in the polycrystalline form of compound. However, the estimated value of the upper critical field H c2(0) is close to the calculated Pauli limit. © 2011 American Physical Society.

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Physical Review B - Condensed Matter and Materials Physics