Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 23: Solids At Low Temperature: Cryogenics
TT 23.4: Vortrag
Mittwoch, 29. März 2006, 15:30–15:45, HSZ 02
Setup für in-situ ac-susceptibility measurements during neutron scattering at low temperatures — •Enrico Faulhaber1, Oliver Stockert2, and Michael Loewenhaupt1 — 1Institut für Festkörperphysik, TU Dresden, D-01062 Dresden — 2Max-Planck-Institut für Chem. Physik fester Stoffe, D-01187 Dresden
Neutrons are a valuable microscopic probe to investigate magnetic ordering phenomena but are insensitive to superconductivity. Driven by our needs to directly correlate magnetism with superconductivity, we designed an in-situ ac-susceptibility setup for use in neutron scattering experiments at low temperatures. The setup follows the classical setup with one excitation coil and two pickup coils. The sample is placed beneath one pickup coil in the neutron beam to reduce the neutron background originating from scattering on the coils. Further, the coils were shielded against neutrons with boron nitride.
The setup has been used successfully in several experiments at the HMI in Berlin and at the ILL in Grenoble. Superconducting transitions could easily be traced. In addition, a recent experiment has shown that the setup is even able to detect magnetic ordering transitions. We will present the realised setup and selected results.