Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 29: Poster Session: Cryogenic Particle Detectors and Cyotechnique

TT 29.15: Poster

Montag, 12. März 2018, 15:00–19:00, Poster B

Phase-sensitive dynamic susceptibility measurement in a pulsed magnetic field — •Lars Postulka, Bernd Wolf, and Michael Lang — Physikalisches Institut, Goethe Universität, SFB/TR49, Frankfurt, DE

Dynamic susceptibility, commonly referred to AC susceptibility, is a powerful tool to characterize magnetic phase transition or spin relaxation processes in the presence of a magnetic field. The standard technique for accessing this quantity is based on measurements of the voltage in a coil which is induced by magnetization changes of a sample due to a small outer oscillating field. Importantly, this setup allows for a phase-sensitive detection of the susceptibility, thereby providing direct access to the dynamics of the spin system. This method is well established for the use in constant magnetic fields. However, in modern solid state physics, interesting physical phenomena emerge in high fields, conveniently accessible by the use of pulsed-field technology. Whereas various techniques to infer the in-phase part of the susceptibility are regularly used, methods to determine the out-of-phase part have not yet been reported. Here we present the first realization of an AC susceptometer for measurements in pulsed field. In particular, we focus on technical aspects including all electronic devices and a possible coil design. We prove the feasibility by measurements of the susceptibility on a spin chain compound.