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Saraiva, Tiago T. ; Vagov, Alexei ; Axt, Vollrath Martin ; Aguiar, J. Albino ; Shanenko, A. A.:
Anisotropic superconductors between types I and II.
In: Physical Review B.
Bd. 99
(2019)
Heft 2
.
- 024515.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.99.024515
Angaben zu Projekten
| Projektfinanzierung: |
This work was supported by the Brazilian agencies
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior,
CAPES (Grants 223038.003145/2011-00 and 400510/2014-06),
Conselho Nacional de Desenvolvimento Científico e
Tecnológico, CNPq (Grants 307552/2012-8 and 141911/2012-3),
and Fundação de Apoio à Ciencia e Tecnologia do Estado de
Pernambuco, FACEPE (APQ-0936-1.05/15).
Further support came from the Russian Science Foundation
under the Project 18-12-00429, used to study connections
between anisotropy and nonlocal interactions in
superconductors within the EGL formalism. |
|---|
Abstract
Self-duality or matching between the magnetic and the condensate coherence lengths is a fundamental property of isotropic superconductors at the critical Bogomolnyi point (B point). The self-dual state of the condensate is infinitely degenerate, which is the core reason for the sharp transition between the superconductivity types in the nearest vicinity of the critical temperature Tc. Below Tc nonlocal interactions in the condensate remove the degeneracy, which leads to the appearance of a finite intertype (IT) domain between types I and II. This domain exhibits the mixed state with exotic field-condensate configurations and nonstandard magnetic response, which cannot be understood within the dichotomy of the conventional superconductivity types. At a first glance, this picture does not apply to an anisotropic system because no spatial matching between the condensate and magnetic field can be generally expected for direction-dependent characteristic lengths. However, contrary to these expectations, here we demonstrate that anisotropic superconductors follow the same scenario of the interchange between types I and II. In anisotropic materials the IT domain is governed by the B point of the effective isotropic model obtained by the appropriate scaling transformation of the initial anisotropic formalism. This transformation depends on the direction of the applied magnetic field, and thus the superconductivity type of strongly anisotropic materials can be dependent on this direction.