Hamburg 2001 – scientific programme
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AM: Magnetismus
AM 5: Anisotropie
AM 5.3: Talk
Monday, March 26, 2001, 17:45–18:00, S 5.4
Anomalies of magnetic and magnetotransport properties of CMR ferrimagnetic semiconductor FeCr2S4 single crystals — •Vladimir Tsurkan1,2, Joachim Hemberger1, Mattias Klemm1, Stefan Klimm1, Hans-Albrecht Krug von Nidda1, Alois Loidl1, Siegfried Horn1, and Reinhard Tidecks1 — 1Institute of Physics, University of Augsburg, Universitaetsstrasse 1, D-86159 Augsburg, Germany — 2Institute of Applied Physics, Moldova Academy of Sciences
Magnetization, susceptibility, electron-spin-resonance (ESR) and transport properties of the colossal magnetoresistance (CMR) FeCr2S4 crystals at normal and high hydrostatic pressure are studied. DC magnetization and AC susceptibility exhibit a spin-glass-like anomaly at Tm (60K), increasing with pressure by 2.7 K/kbar. Magnetoresistance and resistivity exhibit an anomaly at Tm and a dependence on the pressure correlated with the magnetization. Pressure decreases the resistivity and shifts the negative magnetoresistance maximum at the Curie temperature to higher temperatures. A strong shift of the ESR lines to low fields on decreasing temperature for easy magnetization direction, [001], and to high fields for hard directions, [110] and [111], was observed. In detail ESR spectra show a complicated temperature dependence.