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TT: Fachverband Tiefe Temperaturen
TT 16: CE: Quantum-Critical Phenomena 1
TT 16.6: Vortrag
Dienstag, 23. März 2010, 15:15–15:30, H19
Larmor Diffraction in the Ferromagnetic Superconductor UGe2 — •Robert Ritz1, Dmitry Sokolov2, Thomas Keller3, Andrew Huxley2, and Christian Pfleiderer1 — 1Physik Department E21, TU München, D-85748 Garching, Germany — 2School of Physics and Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3JZ, UK — 3MPI für Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany
Larmor Diffaction (LD) is a neutron resonance spin-echo technique which allows the study of the lattice constant as well the distribution of lattice constants. It was traditionally thought that neutron spin-echo measurements cannot be used in materials such as superconductors or ferromagnets, because they strongly depolarize a polarized neutron beam. In UGe2 we are able to demonstrate that this technique may be applied in ferromagnetic superconductors with a magnetic Ising anisotropy. UGe2 exhibits two ferromagnetic phases which are separated by a transiton at temperature Tx. With increasing hydrostatic pressure superconductivity emerges at the pressure for which Tx is suppressed. Using LD we studied the temperature dependence of the lattice constant as well as the distribution of lattice constants for all three axis of UGe2 down to 0.5 K and at pressures up to 12 kbar.