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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
article number
035004
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
2016-04-01 14:53:41
date last changed
2022-02-19 21:25:43
@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.}},
  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}},
  doi          = {{10.1088/0953-2048/25/3/035004}},
  volume       = {{25}},
  year         = {{2012}},
}