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SM ISO690:2012 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 | |
Rezumat | |
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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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, T<sub>C</sub>, 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. 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