New ferromagnetic molybdenum spinels

Universal mechanism of tetrahedral metal cluster formation in structures with breathing pyrochlore sublattices

“…We believe that the formation of these clusters is the main reason of the unusual physical properties of these phases. There are many experimental examples which confirm with the considered concept of the universal mechanism of cluster formation [21][22][23][24][25][26][27][28].…”

“…[23][24][25]. According to our concept, B 4 -clusters are also in the structures of these substances.…”

Electronic Structure of Vacancy Ordered Spinels, GaMo4S8 and GaV4S8, from ab Initio Calculations

“…In this structure, A cations occupy the tetrahedral sites with the B cations in the octahedral sites formed by anions, X, arranged in a cubic close-packed lattice. An interesting variation of this structural motif is provided by compounds AB X such as GaMo S (2,3) and GaV S (4). In the case of these cation-de"cient spinels, only half of the tetrahedral sites are occupied by the A cation, leaving the other sites vacant.…”

Structural phase transition in GaMo4Se8 and AlMo4S8 by X-ray powder diffraction

“…The defect spinels GaMo 4 Se 8 (I) and AlMo 4 S 8 (Π) are ferromagnetic semiconductors with magnetic ordering temperatures at T c = 23 Κ (Barz, 1973) or 26 Κ (Ben Yaich et al, 1984) and r c (II) = 18 Κ (Vandenberg and Brasen, 1975). According to Rastogi and Wohlfarth (1987) I shows heavy fermion behaviour.…”