A1 Journal article – refereed
Anisotropic multiband superconductivity in Zn observed by simultaneous Andreev reflection and Yanson point-contact spectroscopy




List of Authors: Yu. G. Naidyuk, K. Gloos
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Publication year: 2014
Journal: Solid State Communications
Journal name in source: SOLID STATE COMMUNICATIONS
Journal acronym: SOLID STATE COMMUN
Volume number: 184
Number of pages: 5
ISSN: 0038-1098

Abstract


Anclreev reflection (AR) and Yanson point-contact spectroscopy (PCS) have been applied simultaneously to study the superconducting (SC) gap and the electron-phonon interaction (ED) in a Zn single crystal. The correlation between SC gap value and EPI spectrum allowed us to establish the anisotropy of the SC gap. Evidence for multibancl superconductivity in Zn is present with two gaps related as 1:13. We also found that the AR features are more robust against the point-contact quality than the ED ones, possibly, due to the large coherence length in Zn compared to the typical PC size. Even for the PCs close to the ballistic regime with intense EPI spectra, the transmission coefficient evaluated from the AR spectra is near the one predicted theoretically for the diffusive regime of a current flow in the PC. Understanding those phenomena would provide a more reliable basis to apply both types of spectroscopies to study more complex SCs. (C) 2014 Elsevier Ltd. All rights reserved



Last updated on 2019-21-08 at 20:16