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MA: Fachverband Magnetismus
MA 19: Characterization and Instrumentation
MA 19.5: Vortrag
Montag, 16. März 2020, 18:15–18:30, HSZ 101
High-field thermal expansion and magnetostriction at the High Field Magnet Laboratory (HFML-EMFL) — •Steffen Wiedmann1, Masoumeh Keshavarz2, Lisa Rossi1, Ben Bryant1, and Robert Kuechler3 — 1Field Magnet Laboratory (HFML-EMFL), IMM, Radboud University, Nijmegen, the Netherlands — 2Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Leuven, Belgium — 3Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
Thermal expansion and magnetostriction experiments are an important and very sensitive tool for the investigation of phase transitions in condensed matter. At the high Field Magnet Laboratory (HFML) in Nijmegen, capacitive dilatometry that allows to measure both quantities in magnetic fields up to 38 T and down to 0.3 K has been developed with a resolution down to 0.1 nm at highest magnetic fields [1].
We present the current setups at the HFML and show recent results of dilatometry experiments such as (i) thermal expansion in lead halide perovskite materials to identify their phase transitions temperatures down to 4.2 K [2] and (ii) negative thermal expansion in the high-field, half-magnetization plateau phase of the frustrated magnetic insulator CdCr2O4 [3].
An outlook for further technical development will also be given.
[1] R. Kuechler et al., Review of Scientific Instruments 88 (2017), 083903. [2] M. Keshavarz et al., Advanced Materials 31 (2019), 1900521. [3] L. Rossi et al., Physical Review Letters 123 (2019), 027205.