Anisotropy dependence of the fluctuation spectroscopy in the critical and gaussian regimes in superconducting NaFe1-xCo x As single crystals.
Sci Rep
; 8(1): 8556, 2018 Jun 04.
Article
em En
| MEDLINE
| ID: mdl-29867126
ABSTRACT
We investigate thermal fluctuations in terms of diamagnetism and magnetotransport in superconducting NaFe1-xCo x As single crystals with different doping levels. Results show that in the case of optimal doped and lightly overdoped (x = 0.03, 0.05) crystals the analysis in the critical as well as in the Gaussian fluctuation regions is consistent with the Ginzburg-Landau 3D fluctuation theory. However, in the case of strongly overdoped samples (x ≥ 0.07) the Ullah-Dorsey scaling of the fluctuation induced magnetoconductivity in the critical region confirms that thermal fluctuations exhibit a 3D anisotropic nature only in a narrow temperature region around T c (H). This is consistent with the fact that in these samples the fluctuation effects in the Gaussian region above Tc may be described by the Lawrence-Doniach approach. Our results indicate that the anisotropy of these materials increases significantly with the doping level.
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MEDLINE
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En
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Sci Rep
Ano de publicação:
2018
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Article