SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 18: Posters Magnetism V

MA 18.16: Poster

Freitag, 1. Oktober 2021, 10:00–13:00, P

Measurement of de Haas-van Alphen effect by means of temperature modulation — •Michelle Hollricher, Marc A. Wilde, and Christian Pfleiderer — Department of Physics, Technical University of Munich, D-85748 Garching, Germany

Measurements of the quantum oscillations of the magnetization M as a function of magnetic field B, i.e. the de Haas-van Alphen effect, are a powerful tool for mapping the Fermi surfaces of metals. The most established methods for measuring M ( B ) or other quantities utilize either the magnetic torque or inductively pick up the response to a large-amplitude modulation of B. Here we report the development and characterization of a temperature modulation technique (TMT) for measuring quantum oscillations in M, combining a thermally linked sample-heater-thermometer arrangement with an inductive pick-up. Advantages of the method are the absence of dissipation due to a modulated field and the ability to separate signals arising from orbits with different effective masses. It was found that TMT may prove to be especially advantageous for detecting oscillations related to orbits with heavy effective masses. The TMT was employed on Bi single crystals at temperatures down to 1.9 K and in magnetic fields up to 9 T. Pronounced quantum oscillations well into the quantum limit of the electron pockets were observed.