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Anisotropic superconductors between types I and II

Titelangaben

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 . - Art.Nr. 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.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: superconductivity; anisotropic superconductors; BCS; extended Landau Ginzburg theory; intertype superconductivity; self-duality; nonstandard magnetic response
Fachklassifikationen: condensed matter physics (theoretical)
Institutionen der Universität: Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Theoretische Physik III > Lehrstuhl Theoretische Physik III - Univ.-Prof. Dr. Martin Axt
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 04 Feb 2019 08:44
Letzte Änderung: 04 Feb 2019 08:44
URI: https://eref.uni-bayreuth.de/id/eprint/47162