Unusual two-dimensional behavior of iron-based superconductors with low anisotropy

A. A. Kalenyuk, A. Pagliero, E. A. Borodianskyi, S. Aswartham, S. Wurmehl, B. Büchner, D. A. Chareev, A. A. Kordyuk, and V. M. Krasnov
Phys. Rev. B 96, 134512 – Published 16 October 2017

Abstract

We study angular-dependent magnetoresistance in iron-based superconductors Ba1xNaxFe2As2 and FeTe1xSex. Both superconductors have relatively small anisotropies γ2 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 Hc2(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.

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  • Received 2 June 2017
  • Revised 6 October 2017

DOI:https://doi.org/10.1103/PhysRevB.96.134512

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

A. A. Kalenyuk1,2, A. Pagliero1, E. A. Borodianskyi1, S. Aswartham3, S. Wurmehl3,4, B. Büchner3,4, D. A. Chareev5,6,7, A. A. Kordyuk2,8, and V. M. Krasnov1,*

  • 1Department of Physics, Stockholm University, AlbaNova University Center, SE-10691 Stockholm, Sweden
  • 2Institute of Metal Physics of National Academy of Sciences of Ukraine, 03142 Kyiv, Ukraine
  • 3Leibniz Institute for Solid State and Materials Research Dresden IFW, Institute for Solid State Research, 01069 Dresden, Germany
  • 4Institute for Solid State Physics, TU Dresden, 01062 Dresden, Germany
  • 5Institute of Experimental Mineralogy, Russian Academy of Sciences, 142432 Chernogolovka, Russia
  • 6Institute of Physics and Technology, Ural Federal University, 620002 Ekaterinburg, Russia
  • 7Institute of Geology and Petroleum Technologies, Kazan Federal University, 420008 Kazan, Russia
  • 8Kyiv Academic University, 03142 Kyiv, Ukraine

  • *Vladimir.Krasnov@fysik.su.se

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Vol. 96, Iss. 13 — 1 October 2017

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