Anisotropy dependence of the fuctuation spectroscopy in the critical and gaussian regimes in superconducting NaFe1−xCoxAs single crystals

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2018_nature_ahmad_anisotropy.pdf (1.9 MB)
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URI: http://hdl.handle.net/10347/22056
E-ISSN: 2045-2322
DOI: 10.1038/s41598-018-26939-8

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2018

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Nature Publishing Group
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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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Superconducting properties and materials

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Ahmad, D., Choi, W.J., Sóñora, D. et al. Anisotropy dependence of the fluctuation spectroscopy in the critical and gaussian regimes in superconducting NaFe1−xCo x As single crystals. Sci Rep 8, 8556 (2018). https://doi.org/10.1038/s41598-018-26939-8

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YSK was supported by the NRF grant funded by the Ministry of Science, ICT and Future Planning (2015M2B2A9028507, 2016R1A2B4012672). DA and YSO was partially supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2017R1A4A1015323). DS and JM acknowledge financial support from Project No. FIS2016-79109-P (AEI/FEDER, UE). TP was supported by the NRF grant funded by the Ministry of Science, ICT and Future Planning of Korea (No. 2012R1A3A2048816). YSO was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2015R1C1A1A01055964)

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© The Author(s) 2018. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Te images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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