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Weak localization in FeSe1-xTex superconducting thin films

Chang, H. H.; Luo, J. Y.; Wu, C. T.; Hsu, F. C.; Huang, T. W.; Wu, Phillip LU ; Wu, M. K. and Wang, M. J. (2012) In Superconductor Science & Technology 25(3).
Abstract
We have investigated the magneto-resistivity (MR) of FeSe1-xTex superconducting films on MgO substrate. The MR of pure FeSe and slightly Te-substituted films demonstrates regular Lorentz-type magnetic field dependence, MR similar to B-2. In highly Te-substituted samples, however, negative MR contribution due to the weak-localization effect gradually dominates at low temperature, which is consistent with the evolution of the temperature dependence of resistivity from a metallic to a weakly semiconductor-like behavior. Furthermore, the negative MR weakens and turns positive as temperature approaches the superconducting transition temperature, which is evidence for the Maki-Thompson correction in the weak-localization regime. The experimental... (More)
We have investigated the magneto-resistivity (MR) of FeSe1-xTex superconducting films on MgO substrate. The MR of pure FeSe and slightly Te-substituted films demonstrates regular Lorentz-type magnetic field dependence, MR similar to B-2. In highly Te-substituted samples, however, negative MR contribution due to the weak-localization effect gradually dominates at low temperature, which is consistent with the evolution of the temperature dependence of resistivity from a metallic to a weakly semiconductor-like behavior. Furthermore, the negative MR weakens and turns positive as temperature approaches the superconducting transition temperature, which is evidence for the Maki-Thompson correction in the weak-localization regime. The experimental data can be described very well by the weak-localization theory with the existence of scattering by some magnetic moments. The fitting parameters demonstrate that disorder most likely comes from the excess iron. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Superconductor Science & Technology
volume
25
issue
3
publisher
IOP Publishing
external identifiers
  • wos:000300607500004
  • scopus:84863169465
ISSN
0953-2048
DOI
10.1088/0953-2048/25/3/035004
language
English
LU publication?
yes
id
745c3aed-658a-4182-a0d8-b86cb77c1d8c (old id 2390868)
date added to LUP
2012-03-29 08:01:00
date last changed
2017-08-20 04:12:24
@article{745c3aed-658a-4182-a0d8-b86cb77c1d8c,
  abstract     = {We have investigated the magneto-resistivity (MR) of FeSe1-xTex superconducting films on MgO substrate. The MR of pure FeSe and slightly Te-substituted films demonstrates regular Lorentz-type magnetic field dependence, MR similar to B-2. In highly Te-substituted samples, however, negative MR contribution due to the weak-localization effect gradually dominates at low temperature, which is consistent with the evolution of the temperature dependence of resistivity from a metallic to a weakly semiconductor-like behavior. Furthermore, the negative MR weakens and turns positive as temperature approaches the superconducting transition temperature, which is evidence for the Maki-Thompson correction in the weak-localization regime. The experimental data can be described very well by the weak-localization theory with the existence of scattering by some magnetic moments. The fitting parameters demonstrate that disorder most likely comes from the excess iron.},
  articleno    = {035004},
  author       = {Chang, H. H. and Luo, J. Y. and Wu, C. T. and Hsu, F. C. and Huang, T. W. and Wu, Phillip and Wu, M. K. and Wang, M. J.},
  issn         = {0953-2048},
  language     = {eng},
  number       = {3},
  publisher    = {IOP Publishing},
  series       = {Superconductor Science & Technology},
  title        = {Weak localization in FeSe1-xTex superconducting thin films},
  url          = {http://dx.doi.org/10.1088/0953-2048/25/3/035004},
  volume       = {25},
  year         = {2012},
}