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DY: Fachverband Dynamik und Statistische Physik

DY 23: Finite size effects at phase transitions III (session accompanying the symposium of the same name)

DY 23.4: Vortrag

Mittwoch, 28. März 2007, 16:30–16:45, H3

Bosonic Nature of the Meissner Transition at finite magnetic Field — •Thomas Neuhaus — NIC, FZ-Jülich, Jülich

We study the low temperature 3d finite size rounded Meissner transition at finite magnetic field i.e., in vicinity of the lower critical field. For a type II superconductor one has a line of continuous phase transitions, which at magnetic field zero terminates in the well known 3d XY superfluid critical point. At finite field, the transition is however not of the superfluid kind, but of bosonic nature. The finite size scaling at the tranistion differs from Fisher scaling. This has its origin in the fact, that two length scales : the mean distance of vortices, and the size of vortex line orthogonal fluctuations, are both relevant at the transition.