Andreev reflection study of the new magnetic superconductor Mo3Sb7: evidence of gap anisotropy

Point-contact (PC) Andreev-reflection experiments on the new paramagnetic superconductor Mo3Sb7 are reported for which we have observed strong distinctions in the PC spectra measured for different contact axis orientations. Analysis of the PC spectra in the framework of the Blonder–Tinkham–Klapwijk...

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Veröffentlicht in:Low temperature physics (Woodbury, N.Y.) N.Y.), 2007-04, Vol.33 (4), p.295-299
Hauptverfasser: Dmitriev, V. M., Rybaltchenko, L. F., Khristenko, E. V., Ishchenko, L. A., Bukowski, Z., Troć, R.
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Sprache:eng
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Zusammenfassung:Point-contact (PC) Andreev-reflection experiments on the new paramagnetic superconductor Mo3Sb7 are reported for which we have observed strong distinctions in the PC spectra measured for different contact axis orientations. Analysis of the PC spectra in the framework of the Blonder–Tinkham–Klapwijk theory has shown that the gap parameter Δ is strongly anisotropic, varying over a very wide range depending on the contact orientation: the maximum Δmax can exceed the minimum Δmin by at least 40 times. For these and other reasons we suggest that Mo3Sb7 is not a trivial BCS (s-wave) superconductor but rather has (s+g)-wave or another unconventional pairing symmetry.
ISSN:1063-777X
1090-6517
DOI:10.1063/1.2720074