DPG Phi
Verhandlungen
Verhandlungen
DPG

Regensburg 2013 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

TT: Fachverband Tiefe Temperaturen

TT 64: Superconductivity: Heterostructures, Andreev Scattering, Vortex Physics

TT 64.9: Talk

Thursday, March 14, 2013, 17:15–17:30, H21

Neutron dark field imaging of domain structures in superconductors — •Tommy Reimann1,2, Christian Grünzweig3, Sebastian Mühlbauer1, Michael Schulz1,2, and Peter Böni21TU München, Forschungsneutronenquelle Heinz Maier Leibnitz (FRM II), 85747 Garching, Germany — 2Physik Department E21, TU München, 85747 Garching, Germany — 3Paul-Scherrer-Institut, CH-5232 Villigen, Switzerland

In the intermediate mixed state (IMS) of a type II superconductor (SC), the sample splits up into field-free Meissner domains and Shubnikov domains which carry the vortex lattice. The IMS is analog to the intermediate state (IS) of a type-I superconductor with normal and superconducting domains. Experiments on the topology of both states show a variety of different patterns including striped, dendritic and bubble phases, which represent typical domain morphologies also seen in various other physical contexts. A detailed investigation of domain patterns offers the possibility to study general characteristics of domain nucleation and morphology as well as the physical properties of vortex-vortex interactions. Domain structures in SC are typically investigated by surface sensitive techniques such as magneto optical imaging, but flux pinning as well as Landau branching can significantly hamper the deduction of bulk properties. In this talk we show how neutron grating interferometry (nGI) can be used as a tool for the unambiguous identification of bulk properties. The capability of this unique technique will be demonstrated on Pb and Nb single crystals, which are classical representatives of type I and type II SC respectively.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2013 > Regensburg