Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 46: Magnetic Measurement Methods

MA 46.8: Vortrag

Donnerstag, 10. März 2016, 17:30–17:45, H33

Neutron depolarization imaging of the pressure dependence of HgCr₂Se₄ — •Pau Jorba¹, Philipp Schmakat¹, Michael Wagner¹, Alexander Regnat¹, Michael Schulz², Vladimir Tsurkan³, Alois Loidl³, Peter Böni¹, and Christian Pfleiderer¹ — ¹Technische Universität München, Physik Department, Garching, Germany — ²Technische Universität München, Forschungsneutronenquelle Heinz Maier Leibnitz, Garching, Germany — ³University of Augsburg, Center for Electronic Correlations and Magnetism, Augsburg, Germany

The isostructural family of the Chromium spinels (ACr₂X₄) show diverse magnetic ground states due to an interesting variety of competing magnetic interactions between the chromium ions. We report the magnetization of ferromagnetic mercury chromium spinel HgCr₂Se₄ up to 1.7 GPa. To extend these data we used high pressure neutron depolarization measurements, allowing us to quantify the evolution of ferromagnetic domains up to 4 GPa and down to very low temperatures. Surprisingly, the critical temperature displays a complex phase diagram, pointing to a loss of ferromagnetism above 3 GPa. Our results demonstrate, on a proof of principle level, the feasibility of combining miniaturized moissanite anvil cells, with neutron depolarization imaging. This paves the way for studies of ferromagnetic and superconducting phases up to very high pressures in a rather simple manner.