Browsing by Author "Moure, Carlos"

Filter results by typing the first few letters
Now showing 1 - 1 of 1
  • Thumbnail Image
    Publication
    Effect of cation substitution on magnetic properties in Mn1−xA’xCr2S4 (A’ = Cd, Zn) thiospinel series
    (2007) Moure, Carlos; Cruzat Contreras, Christian Américo; Raison, Ch; Manríquez Castro, Víctor; Galdámez Silva, Antonio César; Barahona Huenchumil, Patricia Mabel; Le Coz, Xavier; Peña, Octavio
    Colossal magnetoresistance (CMR) materials such as REMnO3 perovskites and AB2S4 thiospinels have been well studied in the past. The authors present thiospinel compounds with A = Mn, since they may be viewed as a link to REMnO3 CMR perovskites. Ferrimagnetic MnCr2S4 is known to present a T c of 65 K and a magnetic transition towards a non-collinear Yafet-Kittel state. The (Mn1−xA’x)Cr2S4 series (A = Cd, Zn) was synthesised at 850°C. This series crystallises in the space group Fd3m with a close to 10 Å. When A’ = Cd (T c ranging from 68 K, x = 0·2, to 79 K, x = 0·6), the ferromagnetic features are enhanced, indicating that antiferromagnetism between Mn spins is progressively lost. For A’ = Zn, two magnetic transitions take place, one at 15 K, which is reminiscent of the antiferromagnetic state of ZnCr2S4 and another one at T c = 115 K. Impurities which could be responsible of these two magnetic states are excluded.