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Mixed State of a Dirty Two-Band Superconductor: Application to MgB2 A. E. Koshelev
 

Summary: Mixed State of a Dirty Two-Band Superconductor: Application to MgB2
A. E. Koshelev
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
A. A. Golubov
Department of Applied Physics, University of Twente, 7500 AE Enschede, The Netherlands
(Received 25 October 2002; published 29 April 2003)
We investigate the vortex state in a two-band superconductor with strong intraband and weak
interband electronic scattering rates. Coupled Usadel equations are solved numerically, and the
distributions of the pair potentials and local densities of states are calculated for two bands at different
values of magnetic fields. The existence of two distinct length scales corresponding to different bands is
demonstrated. The results provide qualitative interpretation of recent scanning tunneling microscopy
experiments on vortex structure imaging in MgB2.
DOI: 10.1103/PhysRevLett.90.177002 PACS numbers: 74.25.Ha, 74.20.De, 74.25.Op
A very peculiar feature of the recently discovered
superconductor MgB2 [1] is the multigap nature of the
superconducting state. The possibility of such a state
was first predicted in [2,3] for a multiband superconduc-
tor with large disparity of the electron-phonon interac-
tion for the different Fermi-surface sheets. Various
aspects of multiband superconductivity, in particular,

  

Source: Alexei, Koshelev - Materials Science Division, Argonne National Laboratory

 

Collections: Materials Science; Physics