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![]() FRITSCH, Veronika, DEISENHOFER, Joachim, FICHTL, Robert, HEMBERGER, Joachim, KRUG VON NIDDA, Hans Albrecht, MUCKSCH, M., NICKLAS, Michael, SAMUSI, D., THOMPSON, Joe D., TIDECKS, Reinhard, TSURKAN, Vladimir, LOIDL, Alois. Anisotropic colossal magnetoresistance effects in Fe1-xCuxCr2S4. In: Physical Review B - Condensed Matter and Materials Physics, 2003, vol. 67, pp. 1444191-1444198. ISSN 1098-0121. |
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Physical Review B - Condensed Matter and Materials Physics | |
Volumul 67 / 2003 / ISSN 1098-0121 /ISSNe 1550-235X | |
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Pag. 1444191-1444198 | |
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A detailed study of the electronic transport and magnetic properties of Fe1-xCuxCr2S4 (x≤0.5) on single crystals is presented. The resistivity is investigated for 2≤T≤300 K in magnetic fields up to 140 kOe 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, TC, and increases strongly towards lower temperatures. Increasing the Cu concentration reduces this effect. At temperatures below 35 K the magnetoresistance. MR=[ρ(O) -ρ(H)]/ρ(O), 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 in 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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Cuvinte-cheie Anisotropy, article, electron transport, Hydrostatic pressure, magnetic field, magnetism, Nuclear Magnetic Resonance, Temperature dependence |
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