Andreev Reflection Study of the Superconductor Mo3Sb7 |
| V.M. Dmitriev a, b, L.F. Rybaltchenko a, E.V. Khristenko a, L.A. Ishchenko a, Z. Bukowski c and R. Troć c
a B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 61103 Kharkiv, Ukraine b International Laboratory of High Magnetic Fields and Low Temperatures, P.O. Box 4714, 50-985 Wrocław 47, Poland c W. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław 2, Poland |
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| Received: 6 11 2007; |
| The point-contact Andreev-reflection measurements on the new paramagnetic superconductor Mo3Sb7 were carried out. It was found that the order parameter Δ is strongly anisotropic varying over a very wide range depending on the contact orientation when the maximum Δmax exceeds at least 40 times the minimum Δmin in spite of the invariable Tc that cannot be typical of conventional superconductors. For these and other reasons we suggest that Mo3Sb7 is not a trivial BCS (s-wave) superconductor but rather has some unconventional pairing symmetry. |
| DOI: 10.12693/APhysPolA.114.263 PACS numbers: 74.70.Ad |