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Competition between BCS and FFLO States in Magnetic Superconductors in a Cryptoferromagnetic Phase

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Abstract

The possibility of appearance of inhomogeneous superconducting Fulde—Ferrell—Larkin—Ovchinnikov (FFLO) states in magnetic superconductors in a cryptoferromagnetic phase with helical magnetic ordering has been analyzed. The dependence of the critical temperature on the angle between the wave vectors of the spatial modulation of the FFLO state and helical magnetic structure has been calculated within the proposed model. It has been shown that their mutually perpendicular orientation corresponds to the most energetically favorable state. The numerical calculations have also shown the existence of a tricritical point on a line separating the Bardeen—Cooper—Schrieffer and FFLO phases on the phase diagram of states. Furthermore, FFLO states can appear in a magnetic superconductor even at fairly strong exchange fields because of the difference between the effective masses of conduction electrons in different spin subbands and the anisotropy of the Fermi surface.

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Funding

This work was supported by the Russian Foundation for Basic Research, project no. 18-02-40137.This work was supported by the Ministry of Science and Higher Education of the Russian Federation (project no. 3.2166.2017).

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Authors and Affiliations

  1. Kazan Federal University, Kazan, 420008, Russia

    F. M. Siraev, A. S. Kutuzov, M. V. Avdeev & Yu. N. Proshin

Authors
  1. F. M. Siraev
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  2. A. S. Kutuzov
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  3. M. V. Avdeev
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  4. Yu. N. Proshin
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Corresponding author

Correspondence to M. V. Avdeev.

Additional information

Russian Text © The Author(s), 2020, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2020, Vol. 111, No. 3, pp. 154–159.

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Siraev, F.M., Kutuzov, A.S., Avdeev, M.V. et al. Competition between BCS and FFLO States in Magnetic Superconductors in a Cryptoferromagnetic Phase. Jetp Lett. 111, 139–144 (2020). https://doi.org/10.1134/S0021364020030133

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  • DOI: https://doi.org/10.1134/S0021364020030133

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