Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 32: Spintronics and magnetic semiconductors (MA, jointly with HL)
HL 32.10: Vortrag
Dienstag, 12. März 2013, 11:45–12:00, H3
Magnetism in geometrically frustrated HgCr2Se4 — •Michael Wagner1, Sarah Dunsiger1, Vladimir Tsurkan2, Alois Loidl2, and Christian Pfleiderer1 — 1Physik Department E21, Technische Universität München, 85748 Garching, Germany — 2Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany
Geometrically frustrated spin systems on a pyroclore lattice are prone to competing antiferromagnetic and ferromagnetic interactions. Under hydrostatic pressure the relative strength of the various magnetic interactions may be changed driving phase transitions of the ground state. We studied the chromium spinel HgCr2Se4, a ferromagnetic semiconductor with Tc ≈ 106 K. We have measured the magnetization under pressure with a bespoke Cu:Be piston cylinder cell. Our measurements were carried out on a single crystal prepared by chemical transport reaction. As a function of temperature the magnetization vanishes at the curie temperature Tc which decreases as a function of pressure consistent with literature [1]. Furthermore we find some indications of critical behaviour.
[1] V. Srivastava. Journal of Applied Physics, 40:3, 1969