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Unusual two-dimensional behavior of iron-based superconductors with low anisotropy
Stockholm University, Faculty of Science, Department of Physics. Institute of Metal Physics of National Academy of Sciences of Ukraine, Ukraine.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
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Number of Authors: 9
2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 96, no 13, 134512Article in journal (Refereed) Published
Abstract [en]

We study angular-dependent magnetoresistance in iron-based superconductors Ba1-xNaxFe2As2 and FeTe1-xSex. Both superconductors have relatively small anisotropies gamma similar to 2 and exhibit a three-dimensional (3D) behavior at low temperatures. However, we observe that they start to exhibit a profound two-dimensional behavior at elevated temperatures and in applied magnetic field parallel to the surface. We conclude that the unexpected two-dimensional (2D) behavior of the studied low-anisotropic superconductors is not related to layeredness of the materials, but is caused by appearance of surface superconductivity when magnetic field exceeds the upper critical field H-c2(T) for destruction of bulk superconductivity. We argue that the corresponding 3D-2D bulk-to-surface dimensional transition can be used for accurate determination of the upper critical field.

Place, publisher, year, edition, pages
2017. Vol. 96, no 13, 134512
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Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-149008DOI: 10.1103/PhysRevB.96.134512ISI: 000413050000004OAI: oai:DiVA.org:su-149008DiVA: diva2:1158360
Available from: 2017-11-20 Created: 2017-11-20 Last updated: 2017-11-29Bibliographically approved

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Borodianskyi, Evgenii A.Chareev, D. A.Krasnov, Vladimir M.
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