Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 23: Posters Superconductivity, Solids at Low Temperature

TT 23.40: Poster

Montag, 7. März 2005, 14:00–18:00, Poster TU D

Polarised SANS measurements of the FLL in niobium — •Sebastian Mühlbauer¹, Robert Georgii² und Peter Böni¹ — ¹TU-München Physikdepartment E21 — ²ZWE FRM II TU-München

We report on polarised small angle neutron scattering (SANS) on the flux line lattice (FLL) of a well known classic superconductor, niobium on the reflectometer MIRA at the FRM-II in Garching. The six-fold symmetry of the scattering pattern of the FLL was recorded with a two-dimensional position sensitive SANS detector using a horizontal and vertical field geometry and an incident wavelenght of 10 Å. Even the second order peaks could be observed. We examined the chirality of the FLL, especially close to the on-set of the so-called flux line melting. The results of these measurements will be dicussed with special emphasis on future measurements on high T_c superconducters.