Tunneling spectra of break junctions involving Nb 3Sn

Toshikazu Ekino, Akira Sugimoto, Yuta Sakai, Alexander M. Gabovich, Jun Akimitsu

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The electronic gap structure of Nb3Sn was measured by the break-junction (BJ) tunneling technique. The superconducting gap values are estimated to be in the range 2{increment} = 4-5.5 meV at T = 4.2 K as follows from the observed distinct conductance peaks. In addition to the superconducting gap structure, we observed reproducible hump-like structures at the biases of about ±20 and ±50 mV. Such a coexistence of gap and hump structures resembles the situation found in the high-Tc copper-oxide superconductors. Above the superconducting critical temperature Tc ~ 18 K, the humps appear as the only gap-like structures. Their possible origin is discussed in connection to the structural phase transition occurring in Nb3Sn.

Original languageEnglish
Article number1.4897415
JournalLow Temperature Physics
Issue number10
Publication statusPublished - Oct 1 2014
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Ekino, T., Sugimoto, A., Sakai, Y., Gabovich, A. M., & Akimitsu, J. (2014). Tunneling spectra of break junctions involving Nb 3Sn. Low Temperature Physics, 40(10), [1.4897415]. https://doi.org/10.1063/1.4897415