Polarization of the spontaneous magnetic field and magnetic fluctuations in s+is anisotropic multiband superconductors
Vadimov, V. L., & Silaev, M. (2018). Polarization of the spontaneous magnetic field and magnetic fluctuations in s+is anisotropic multiband superconductors. Physical Review B, 98(10), Article 104504. https://doi.org/10.1103/physrevb.98.104504
Published inPhysical Review B
© 2018 American Physical Society
We show that multiband superconductors with broken time-reversal symmetry can produce spontaneous currents and magnetic fields in response to the local variations of pairing constants. Considering the iron pnictide superconductor Ba1−xKxFe2As2 as an example we demonstrate that both the point-group symmetric s+is state and the C4-symmetry-breaking s+id states produce, in general, the same magnitudes of spontaneous magnetic fields. In the s+is state these fields are polarized mainly on an ab crystal plane, whereas in the s+id state their ab-plane and c-axis components are of the same order. The same is true for the random magnetic fields which are produced by the order parameter fluctuations near the critical point of the time-reversal symmetry-breaking phase transition. Our findings can be used as a direct test of the s+is/s+id dichotomy and the additional discrete symmetry-breaking phase transitions with the help of muon spin-relaxation experiments.
PublisherAmerican Physical Society
Publication in research information system
MetadataShow full item record
Related funder(s)Academy of Finland
Funding program(s)Research post as Academy Research Fellow, AoF
Additional information about fundingThis work was supported by the Academy of Finland (Project No. 297439), the Russian Foundation for Basic Research (Grants No. 17-52-12044 and No. 18-02-00390), and the Foundation for the Advancement of Theoretical Physics “BASIS” Grant No. 109.
Showing items with similar title or keywords.
Winyard, Thomas; Silaev, Mikhail; Babaev, Egor (American Physical Society, 2019)Multiband superconductors have a sufficient number of degrees of freedom to allow topological excitations characterized by skyrmionic topological invariants. In the most common, clean s -wave multiband systems, the ...
Winyard, Thomas; Silaev, Mikhail; Babaev, Egor (American Physical Society, 2019)Since Ginzburg and Landau's seminal work in 1950, superconducting states have been classified by the hierarchy of the fundamental length scales of the theory, the magnetic-field penetration lengths and coherence lengths. ...
Magnetic field-controlled 0−π transitions and their experimental signatures in superconductor-ferromagnet-superconductor junctions Vargunin, A.; Silaev, M. A. (American Institute of Physics, 2020)Superconductor-ferromagnet-superconductor Josephson junctions are known to exist in the 0 and π states with the transitions between them controlled by the temperature and ferromagnetic interlayer thickness. We demonstrate ...
Quasiclassical free energy of superconductors : Disorder-driven first-order phase transition in superconductor/ferromagnetic-insulator bilayers Virtanen, Pauli; Vargunin, Artjom; Silaev, Mikhail (American Physical Society, 2020)n the seminal work by G. Eilenberger, Z. Phys. 214, 195 (1968), a closed-form expression for the free energy of inhomogeneous spin-singlet superconductor in terms of quasiclassical propagators has been suggested. However, ...
Garaud, Julien; Corticelli, Alberto; Silaev, Mikhail; Babaev, Egor (American Physical Society, 2018)In multiband systems, such as iron-based superconductors, the superconducting states with locking and antilocking of the interband phase differences are usually considered as mutually exclusive. For example, a dirty two-band ...