Anisotropic Colossal Magnetoresistance Effects in Fe_{1-x}Cu_xCr_2S_4

V. Fritsch; J. Deisenhofer; R. Fichtl; J. Hemberger; H. -A. Krug von Nidda; M. Muecksch; M. Nicklas; D. Samusi; J. D. Thompson; R. Tidecks; V. Tsurkan; A. Loidl

doi:10.1103/PhysRevB.67.144419

paper

Anisotropic Colossal Magnetoresistance Effects in Fe_{1-x}Cu_xCr_2S_4

arXiv:cond-mat/0210134 · doi:10.1103/PhysRevB.67.144419

Abstract

A detailed study of the electronic transport and magnetic properties of Fe $_{1 - x}$ Cu $_{x}$ Cr $_{2}$ S $_{4}$ ( $x \leq 0.5$ ) on single crystals is presented. The resistivity is investigated for $2 \leq T \leq 300$ K in magnetic fields up to 14 Tesla and under hydrostatic pressure up to 16 kbar. In addition magnetization and ferromagnetic resonance (FMR) measurements were performed. FMR and magnetization data reveal a pronounced magnetic anisotropy, which develops below the Curie temperature, $T_{C}$ , and increases strongly towards lower temperatures. Increasing the Cu concentration reduces this effect. At temperatures below 35 K the magnetoresistance, $M R = \frac{ρ ( 0 ) - ρ ( H )}{ρ ( 0 )}$ , exhibits a strong dependence on the direction of the magnetic field, probably due to an enhanced anisotropy. Applying the field along the hard axis leads to a change of sign and a strong increase of the absolute value of the magnetoresistance. On the other hand the magnetoresistance remains positive down to lower temperatures, exhibiting a smeared out maximum with the magnetic field applied along the easy axis. The results are discussed in the ionic picture using a triple-exchange model for electron hopping as well as a half-metal utilizing a band picture.

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Anisotropic Colossal Magnetoresistance Effects in Fe_{1-x}Cu_xCr_2S_4

Abstract

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