Evidence for two superconducting energy gaps in MgB2 by point-contact spectroscopy
P. Szabo, P. Samuely, J. Kacmarcik, Th. Klein, J. Marcus, D. Fruchart, S. Miraglia, C. Marcenat, A. G. M. Jansen
Abstract
Experimental support is found for the multiband model of the superconductivity in the recently discovered system MgB2 with the transition temperature Tc = 39 K. By means of Andreev reflection evidence is obtained for two distinct superconducting energy gaps. The sizes of the two gaps (DeltaS = 2.8 meV and DeltaL = 7 meV) are respectively smaller and larger than the expected weak coupling value. Due to the temperature smearing of the spectra the two gaps are hardly distinguishable at elevated temperatures but when a magnetic field is applied the presence of two gaps can be demonstrated close to the bulk Tc in the raw data.
Create a lesson
Related papers
Superconductivity in Pb2-xBixPd Single Crystals
S. Srivastava, R. P. Singh
Type-I superconductivity in a quasi-2D topologically nontrivial YbBi2
Karolina Górnicka, Sudip Malick, Joanna Bławat et al.
Generic thermodynamics of condensates with extremely small superfluid density ---Application to UTe2 and hidden second phase transition---
Kazushige Machida
Vortex-mediated spin current injection into two-dimensional superconductor NbSe2
Meng Yang, Xiaolong Yin, Jingjing Liu et al.
Superconductivity at the metal-insulator phase boundary in a bulk nickelate at ambient pressure
Hyo-Bin Ahn, Xinglong Chen, Hong Zheng et al.
Crystallographic imperfections and exotic superconductivity of UBe13
Andreas Leithe-Jasper, Markus König, Yusei Shimizu et al.