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4174891 
Journal Article 
Substitution effects and magnetic order in the sulfide spinels MnLu2S4 and MnLu1.8Me0.2S4 (Me = Ho, Er and Cr) 
Barahona, P; Llanos, J; Pena, O 
2006 
Yes 
Journal of Materials Chemistry
ISSN: 0959-9428
EISSN: 1364-5501 
16 
16 
1567-1572 
WOS:000236713700012 
The synthesis, crystallochemical and magnetic properties of sulfide spinels based on manganese and lutetium are reported. The stoichiometric non-substituted compound MnLu2S4 is a normal spinel, with manganese at the tetrahedral sites and lutetium at the octahedral sites. The experimental magnetic moment indicates a 2+ oxidation state for Mn. Partial substitution of lutetium by Er and Ho slightly weakens the antiferromagnetic character of the Weiss parameter (Theta = -15 K for MnLu2S4) due to a larger separation of the Mn2+ ions, but it does not create any magnetic interaction, neither between the RE ions nor between the manganese spins. Inversely, 10% substitution of lutetium by chromium Cr3+ (MnLu1.8Cr0.2S4) triggers long-range ferromagnetic interactions below T-c = 67 K, although antiferromagnetic components still predominate. The ordered state, ferrimagnetic or AF-canted type, is studied by ZFC/FC cycles under different fields and temperatures.