Type-1.5 superconductivity in multicomponent systems

Datum

08.04.2014

Zeit

16:40 - 18:10

Sprecher

Prof. Dr. Egor Babaev

Zugehörigkeit

KTH Stockholm & University of Massachusetts Amherst

Serie

TUD Physikalisches Kolloquium

Sprache

en

Hauptthema

Physik

Andere Themen

Physik

Host

Prof. Dr. Carsten Timm, Fachrichtung Physik

Beschreibung

Superconductivity is a state where electric charge flows without resistance. In type-1 and type-2 superconductors the charge flow patterns (supercurrent) are dramatically different. A type-1 superconductor, in response to a weak magnetic field, creates a supercurrent near its surface and expels the applied magnetic field from its interior. Type-2 superconductivity was experimentally discovered by Shubnikov in 1937. Applied magnetic field (and thus supercurrent) can gradually penetrate in the bulk of these superconductors. In mid-1950, A. A. Abrikosov explained type-2 behavior as the formation of the specific supercurrent pattern in an applied external field: a regular lattice of quantum vortices. I will present arguments that some of the newly discovered multicomponent materials can have several coherence lengths and as a consequence of it to have a different kind of superconductivity, which breaks the type-1/type-2 dichotomy. It was recently termed "type-1.5 superconductivity". This is a state where type-1 and type-2 flows are not antogonistic but coexistent. In external field such a material can exhibit a macroscopic phase separation into vortex clusters and domains of Meissner state. I will overview the theory of type-1.5 superconductivity and current experimental pursuit of its observation.

Links

• http://tu-dresden.de/veranstaltungen/termin?id=TUD53171b0971c31

Letztmalig verändert: 08.04.2014, 10:02:52