The structure, Raman spectroscopy and evidence of ferromagnetic transition in CuCr< sub> 1− x</sub> M< sub> x</sub> O< sub> 2</sub>(M= Mn and Rh) compounds - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Magnetism and Magnetic Materials Année : 2013

The structure, Raman spectroscopy and evidence of ferromagnetic transition in CuCr< sub> 1− x M< sub> x O< sub> 2(M= Mn and Rh) compounds

Résumé

The CuCr1−xMxO2 (M=Mn, Rh) polycrystalline powders were synthesized by the direct solid state reaction of Cu2O and M2O3 (M=trivalent cation or mixer of trivalent cation for transition metal). The magnetic susceptibility was measured in the temperature range of 0-300 K. It was found that the magnetic susceptibility (χ) increases rapidly with the doping of Cr3+ by Mn3+ and Rh3+ ions with existence of paramagnetic substance at low temperature. With the substitution of magnetic Mn3+ and Rh3+ for Cr3+ (S=3/2), the antiferromagnetic (AF) transition becomes broader and the transition temperature increases. However, at low temperature, the magnetic data for CuCr1−xMxO2 (M=Mn, Rh) show evidence for weak ferromagnetic (FM) transition between 100 K and 130 K. Clear hysteresis loops indicate that FM order exists in both of them Mn or Rh-doped samples at 4 K. All samples behave like semiconductors. The ferromagnetism properties can be attributed to the double exchange interaction between the Mn3+ or Rh3+ and Cr3+ semiconductors compounds.
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Dates et versions

hal-00941940 , version 1 (04-02-2014)

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T. Elkhouni, M. Amami, Claire Colin, Pierre Strobel, A. Ben Salah. The structure, Raman spectroscopy and evidence of ferromagnetic transition in CuCr< sub> 1− x M< sub> x O< sub> 2(M= Mn and Rh) compounds. Journal of Magnetism and Magnetic Materials, 2013, 355, pp.158. ⟨10.1016/j.jmmm.2013.12.004⟩. ⟨hal-00941940⟩

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