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Title: Interband coupling and transport interband scattering in s± superconductors

Abstract

A two-band model with repulsive interband coupling and interband transport (potential) scattering is considered to elucidate their effects on material properties. In agreement with previous work, we find that the bands order parameters Δ1,2 differ and the large is at the band with a smaller normal density of states (DOS), Nn2 < Nn1. However, the bands energy gaps, as determined by the energy dependence of the DOS, are equal due to scattering. For each temperature, the gaps turn zero at a certain critical interband scattering rate, i.e. for strong enough scattering the model material becomes gappless. In the gapless state, the DOS at the band 2 is close to the normal state value, whereas at the band 1 it has a V-shape with non-zero minimum. When the normal bands DOS' are mismatched, Nn1 6= Nn2, the critical temperature Tc is suppressed even in the absence of interband scattering, Tc(Nn1) has a dome-like shape. With increasing interband scattering, the London penetration depth at low temperatures evolves from being exponentially at to the powerlaw and even to near linear behavior in the gapless state, the latter being easily misinterpreted as caused by order parameter nodes.

Authors:
 [1];  [2]
  1. Ames Lab., Ames, IA (United States)
  2. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1326830
Report Number(s):
IS-J 9052
DOE Contract Number:  
AC02-07CH11358
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Kogan, Vladimir, and Prozorov, Ruslan. Interband coupling and transport interband scattering in s± superconductors. United States: N. p., 2016. Web. doi:10.2172/1326830.
Kogan, Vladimir, & Prozorov, Ruslan. Interband coupling and transport interband scattering in s± superconductors. United States. https://doi.org/10.2172/1326830
Kogan, Vladimir, and Prozorov, Ruslan. 2016. "Interband coupling and transport interband scattering in s± superconductors". United States. https://doi.org/10.2172/1326830. https://www.osti.gov/servlets/purl/1326830.
@article{osti_1326830,
title = {Interband coupling and transport interband scattering in s± superconductors},
author = {Kogan, Vladimir and Prozorov, Ruslan},
abstractNote = {A two-band model with repulsive interband coupling and interband transport (potential) scattering is considered to elucidate their effects on material properties. In agreement with previous work, we find that the bands order parameters Δ1,2 differ and the large is at the band with a smaller normal density of states (DOS), Nn2 < Nn1. However, the bands energy gaps, as determined by the energy dependence of the DOS, are equal due to scattering. For each temperature, the gaps turn zero at a certain critical interband scattering rate, i.e. for strong enough scattering the model material becomes gappless. In the gapless state, the DOS at the band 2 is close to the normal state value, whereas at the band 1 it has a V-shape with non-zero minimum. When the normal bands DOS' are mismatched, Nn1 6= Nn2, the critical temperature Tc is suppressed even in the absence of interband scattering, Tc(Nn1) has a dome-like shape. With increasing interband scattering, the London penetration depth at low temperatures evolves from being exponentially at to the powerlaw and even to near linear behavior in the gapless state, the latter being easily misinterpreted as caused by order parameter nodes.},
doi = {10.2172/1326830},
url = {https://www.osti.gov/biblio/1326830}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Apr 04 00:00:00 EDT 2016},
month = {Mon Apr 04 00:00:00 EDT 2016}
}

Thesis/Dissertation:
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