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

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

2002-10-07

arxiv.org/abs/cond-mat/0210134v3

Phys. Rev. B 67, 144419, (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

some typos corrected

Scientific paper

10.1103/PhysRevB.67.144419

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, $T_{\mathrm{C}}$, and increases strongly towards lower temperatures. Increasing the Cu concentration reduces this effect. At temperatures below 35 K the magnetoresistance, $MR = \frac{\rho(0) - \rho(H)}{\rho(0)}$, 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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