Imaging Quantum Mechanical Effects in Superconductors with Polarized Neutrons

Autor:	Wolfgang Treimer, O. Ebrahimi, N. Karakas
Rok vydání:	2013
Předmět:	Superconductivity Physics lead Flux pinning Condensed matter physics superconductivity Neutron imaging neutron imaging Meissner effect General Medicine Trapping Physics and Astronomy(all) Polarized neutrons Magnetic flux Magnetic field flux pinning Condensed Matter::Superconductivity Neutron
Zdroj:	Physics Procedia. 42:31-38
ISSN:	1875-3892
DOI:	10.1016/j.phpro.2013.03.172
Popis:	Macroscopic Quantum effects such as the Meissner effect and magnetic flux trapping in massive, pure poly-crystalline lead samples and in a low purity crystalline sample having non-superconducting parts could be visualized and quantified by radiography with polarized neutrons. A uniform poly-crystalline Pb sample with a high purity of 1−1×10 −4 weight% and one with a low purity of approx. 85 weight% Pb having non-superconducting parts showed a partial Meissner effect and for B ext = 0 and T T c a non-uniform magnetic flux trapping. Based on radiographies with polarized neutrons the trapped and expelled magnetic fields could be calculated for the uniform lead sample, in the case of the sample which contains non-superconducting parts an asymmetric (also squeezed) field distribution yielded the best fit.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eb24f1c8cb5caf6904d036bd6bbbed3b https://doi.org/10.1016/j.phpro.2013.03.172 Zobrazit plný text záznamu