Effect of cation substitution on magnetic properties in Mn_1−xA′_xCr₂S₄ (A′=Cd, Zn) thiospinel series

Authors: P. Barahona, A. Galdamez, V. Manríquez, C. Cruzat, C. Raison, S. Le Coz, O. Peña, C. Moure

Source: Advances in Applied Ceramics

Publisher: Maney Publishing

Abstract:

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 (Mn_1−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.

Document Type:

DOI: 10.1179/174367609X414125

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