Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 39: Superconductivity: (General) Theory
TT 39.12: Vortrag
Mittwoch, 22. März 2017, 12:30–12:45, HSZ 103
Exotic vortex configurations and superconductors with shallow bands — •Sebastian Wolf1, Alexei Vagov1, Arkady Shanenko2, José Albino Aguiar2, and Vollrath Martin Axt1 — 1Institut for Theoretical Physics III, University Bayreuth, Germany — 2Departamento de Física, Universidade Federal de Pernambuco, Recife, Brazil
Experiments revealed that the magnetic response of superconducting materials that are close to the interchange between type I and type II may be very different from either of the two standard types [1,2]. The interval of such non-conventional behavior, referred to as the inter-type superconductivity, is rather small in traditional materials but can be considerably enlarged in non-conventional multi-band superconductors such as in MgB2 [2]. Theoretical description of this interval requires an approach beyond the traditional Ginzburg-Landau theory. In our work we investigate inter-type superconductors within the framework of the extended Ginzburg-Landau theory [3].
Using this approach we demonstrated a general enlargement tendency for the inter-type domain in multi-band superconductors, especially when one of the contributing bands is shallow. In order to explain the appearance of non-conventional mixed states we studied details of the vortex-vortex interaction, in particular the crossover between the monotonic and the non-monotonic interaction.
[1] U. Krägeloh, Physics Letters A 28, 657-658 (1969)
[2] V. Moshchalkov et al., Phys. Rev. Lett. 102, 117001 (2009)
[3] A. V. Vagov et al., Phys. Rev. B 85, 014502 (2012)