Non-London electrodynamics in a multiband London model : anisotropy-induced nonlocalities and multiple magnetic field penetration lengths
Silaev, M., Winyard, T., & Babaev, E. (2018). Non-London electrodynamics in a multiband London model : anisotropy-induced nonlocalities and multiple magnetic field penetration lengths. Physical Review B, 97(17), Article 174504. https://doi.org/10.1103/physrevb.97.174504
Julkaistu sarjassa
Physical Review BPäivämäärä
2018Tekijänoikeudet
© 2018 American Physical Society
The London model describes strongly type-2 superconductors as massive vector field theories, where the
magnetic field decays exponentially at the length scale of the London penetration length. This also holds for
isotropic multiband extensions, where the presence of multiple bands merely renormalizes the London penetration
length. We show that, by contrast, the magnetic properties of anisotropic multiband London models are not this
simple, and the anisotropy leads to the interband phase differences becoming coupled to the magnetic field. This
results in the magnetic field in such systems having N + 1 penetration lengths, where N is the number of field
components or bands. That is, in a given direction, the magnetic field decay is described by N + 1 modes with
different amplitudes and different decay length scales. For certain anisotropies we obtain magnetic modes with
complex masses. That means that magnetic field decay is not described by a monotonic exponential increment set
by a real penetration length but instead is oscillating. Some of the penetration lengths are shown to diverge away
from the superconducting phase transition when the mass of the phase-difference mode vanishes. Finally the
anisotropy-driven hybridization of the London mode with the Leggett modes can provide an effectively nonlocal
magnetic response in the nominally local London model. Focusing on the two-component model, we discuss the
magnetic field inversion that results from the effective nonlocality, both near the surface of the superconductor
and around vortices. In the regime where the magnetic field decay becomes nonmonotonic, the multiband London
superconductor is shown to form weakly-bound states of vortices.
...
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2469-9950Julkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/28040657
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