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Upper Critical Field of a Two-Band SrFe2 − xNixAs2 Superconductor

  • Condensed Matter
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Abstract

The upper critical field of an iron-based SrFe2 − xNixAs2 superconductor single crystal is measured for the first time in longitudinal and transverse magnetic fields up to 16 T in the basal ab plane and to it along the c axis. The Hc2(0) values are 18 and 25 T for H ∥ c and H ∥ ab, respectively. The anisotropy of the upper critical field γ(T) = Habc2 / Hcc2 decreases monotonically to 1.4 with decreasing temperature. The temperature dependence of Hc2 is not described fully by the Werthamer–Helfand–Hohenberg model taking into account the influence of orbital and spin paramagnetic effects. However, an effective two-band model reproduces well the measured temperature dependence. This indicates the two-band nature of this superconductor, where one of the bands is almost isotropic. According to the two-band model approximation, the contribution from the anisotropic band dominates near Tc, whereas the main contribution at low temperatures comes from the isotropic band with a lower diffusion coefficient.

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Acknowledgments

The measurements were performed on the equipment of the Shared Facility Centre for Studies of HTS and Other Strongly Correlated Materials, Lebedev Physical Institute, Russian Academy of Sciences.

Funding

The work was supported in part by the Ministry of Science and Higher Education of the Russian Federation (project no. 0023-2019-0005).

Author information

Authors and Affiliations

  1. Ginzburg Center for High-Temperature Superconductivity and Quantum Materials, Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991, Russia

    E. I. Maltsev, V. A. Vlasenko, O. A. Sobolevskii, A. V. Sadakov, B. I. Massalimov & K. S. Pervakov

Authors
  1. E. I. Maltsev
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  2. V. A. Vlasenko
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  3. O. A. Sobolevskii
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  4. A. V. Sadakov
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  5. B. I. Massalimov
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  6. K. S. Pervakov
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Corresponding author

Correspondence to V. A. Vlasenko.

Additional information

Russian Text © The Author(s), 2020, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2020, Vol. 111, No. 7, pp. 475–479.

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Maltsev, E.I., Vlasenko, V.A., Sobolevskii, O.A. et al. Upper Critical Field of a Two-Band SrFe2 − xNixAs2 Superconductor. Jetp Lett. 111, 403–407 (2020). https://doi.org/10.1134/S0021364020070061

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  • DOI: https://doi.org/10.1134/S0021364020070061

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