Berlin 2012 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 45: Correlated Electrons: Poster Session
TT 45.90: Poster
Donnerstag, 29. März 2012, 15:00–19:00, Poster B
High-precision magnetisation measurements in pulsed fields — •Lars Postulka, Lukas Hinz, Bernd Wolf, and Michael Lang — Physikalisches Institut Goethe-Universität, SFB/TR 49; Frankfurt
To determine the magnetic behaviour of materials at magnetic fields as high as 50 T, pulsed fields are required. This implies the handling of huge changes of magnetic flux during the magnetic field pulse. For ac-susceptibility measurements, the typical realisation of the experimental setup is done with a pair of compensated coils. In one of these coils a sample is positioned which leads to a change of the inductance and therefore to an induced voltage. However, the large changes of magnetic flux produce a non-negligible background signal if these coils are not identical. Therefore, a modification of the typical sample holder has been constructed which enables reference measurement without a sample to be performed in a convenient way. In addition, we have added an electronic circuit to the experimental setup with which we can adjust the signal of the empty sample holder to zero voltage. The calibration and testing has been done at different temperatures by using a well-characterized material, the paramagnet CuSO4 · 5H2O.