SKM 2021 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 18: Posters Magnetism V
MA 18.17: Poster
Freitag, 1. Oktober 2021, 10:00–13:00, P
Meissner flux repulsion and trapped flux in sub-millimeter size superconductors observed with enhanced neutron depolarization — •Jorba Pau1, Schulz Michael2, Seifert Marc1,2, Tsurkan Vladimir3,4, Böni Peter1, and Pfleiderer Christian1 — 1Physik-Department, Technische Universität München, Garching, Germany — 2Heinz-Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Garching, Germany — 3Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, Augsburg, Germany — 4Institute of Applied Physics, Chisinau, Republic of Moldova
Neutron depolarization is a unique probe which can quantify the level of magnetic inhomogeneity at a mesoscopic scale in the bulk of a sample. We report the construction of a focusing neutron guide module increasing the neutron flux at the focal spot by a factor of 20. This module was used to enhance ND measurements, demonstrating an increase of an order of magnitude in the signal to noise ratio while maintaining the exposure time. The construction and utilization details are addressed. Additionally, a proof of principle experiment on superconducting niobium and lead was conducted. We demonstrate that, with the enhanced ND technique, the Meissner flux repulsion and trapped magnetic flux of very small superconducting samples can be observed. This opens the possibility of using ND to investigate superconductors, ferromagnets, or even spin glasses under very high pressures.