Spin glass behaviour in an antiferromagnetic non-frustrated lattice: Sr₂FeNbO₆perovskite

Synthesis, Structure, and Physical Properties of Cobalt Perovskites: Sr3CoSb2O9 and Sr2CoSbO6−δ

“…50%) the magnetic moment for a HS state with spin only contribution (S"2, 4.9 ) and an IS state (S "1, 2.8 ). Some scenarios could account for such an intermediate magnetic moment, the following being the most plausible ones: (1) the stabilization of Co> ions in IS state (along with HS Co>) by means of an elongated octahedral coordination either by dynamic or static arrangement of the oxygens around the Co> ions (Jahn}Teller distortions) or (2) just by presenting the same features as Sr FeNbO (28), in which the Fe> ions are in HS state but an e!ective magnetic moment lower than expected is calculated because it is a completely disordered perovskite exhibiting a spin-glass transition (ca. 33 K).…”

Magnetic Susceptibilities and Mössbauer Spectra of Perovskites A2FeNbO6 (A=Sr, Ba)

“…1 and the crystal structural parameters are listed in Table 1. FeNbO shows no magnetic phase transition above 32.5 K but behaves as a spin glass below that temperature and that short-range structural ordering of Fe> and Nb> is responsible for the observed behavior (6). Their discussion is based on the observation of the hysteresis loops in which a uniaxial anisotropy is induced in the "eld cooling process.…”

“…Recently, it has become clear that the magnetic properties of some mixed-metal oxides are often more complex than were previously recognized. RodrmH guez et al reported that the cubic perovskite Sr FeNbO shows a spin glass transition from the magnetic susceptibility and hysteresis loop measurements (6). This compound is an insulator with a disordered distribution of magnetic Fe> and nonmagnetic Nb> ions within a unique octahedral site, hence forming a diluted simple cubic lattice.…”

Crucial Role of Site Disorder and Frustration in Unusual Magnetic Properties of Quasi-2D Triangular Lattice Antimonate Na4FeSbO6

“…These magnetic properties are sensitively affected by non-stoichiometry, site disorder and spin frustration [1][2][3]. For instance, a spin-glass behavior arises from the presence of strong spin frustrations induced either by disorders, as found for various oxides [4][5][6][7][8][9][10][11], or by geometrical spin frustrations leading to highly degenerate magnetic ground states [2,3,[12][13][14][15][16][17][18][19]. It is a challenging problem to explore the structure-property relationships in solid-state materials when they possess disorders, because it is difficult not only to recognize its presence, but also to quantify its amount and characterize its effects on physical properties.…”