Tunneling-Spectroscopy Evidence for Two-Gap Superconductivity in a Binary Mo-Re Alloy
| Autor: | Vladimir Tarenkov, V. N. Krivoruchko, Mikhail Belogolovskii, Alexander Dyachenko, A. P. Shapovalov |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Superconductivity Materials science Condensed matter physics Phonon Alloy engineering.material Condensed Matter Physics 01 natural sciences Heat capacity Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Condensed Matter::Superconductivity 0103 physical sciences engineering 010306 general physics Spectroscopy Critical field Order of magnitude Quantum tunnelling |
| Zdroj: | Journal of Superconductivity and Novel Magnetism. 33:569-574 |
| ISSN: | 1557-1947 1557-1939 |
| DOI: | 10.1007/s10948-019-05297-0 |
| Popis: | Expectation of fundamentally new phenomena owing to multiband superconductivity stimulates a search for novel materials with, at least, two distinct gaps in the superconducting state. Recent temperature-dependent electronic heat capacity and lower critical field measurements for molybdenum-rhenium alloys have revealed signatures of two-gap superconductivity. In this letter, we report a direct evidence of two superconducting energy gaps in a Mo1-xRex alloy films probed by single-electron tunneling spectroscopy. Earlier, it was found that the superconducting transition temperature Tc in the alloys with very close atomic concentrations of Mo and Re is about an order of magnitude higher than Tc’s of the constituent elements. Our observation of two distinct gaps in this system testifies in favor of the scenario that relates this enhancement to the interband interaction rather than to specific modifications of the molybdenium phonon spectrum after alloying with rhenium, i.e., a heavy mass defect. |
| Databáze: | OpenAIRE |
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