Tunneling spectra of break junctions involving Nb3Sn

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

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


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 2Δ = 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
Pages (from-to)1182-1186
Number of pages5
JournalFizika Nizkikh Temperatur
Issue number10
Publication statusPublished - Oct 1 2014
Externally publishedYes


  • Break junction
  • Charge density waves
  • Nbsn
  • Superconducting energy gap
  • Tunneling

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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