Cyclotron mass-selective de Haas–van Alphen measurements using temperature modulation

Abstract

We present a temperature-modulated de Haas–van Alphen measurement technique that allows selective addressing of quantum oscillations with different effective masses m∗ using a non-monotonic amplitude evolution with temperature and magnetic field, governed by the temperature derivative of the Lifshitz–Kosevich factor. The technique relies on harmonic modulation of the sample temperature and phase-sensitive detection of quantum oscillations in the voltage induced in a pickup coil. We use a set of frequencies with strong Zeeman-driven harmonic content in the compensated topological semimetal MoSi2 as a natural linear mass comb ranging from 1 m∗ to 13 m∗ to demonstrate the tunability of the mass-dependent quantum oscillation amplitudes experimentally. The technique allows us to reliably isolate weak contributions of heavy orbits that are inaccessible in conventional de Haas–van Alphen frequency spectra because their frequency peaks overlap with much stronger frequency peaks of lighter orbits.