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- W1979068362 abstract "The most commonly offered interpretation of the low magnetic moments of chromium-containing spinels has relied on the existence of the Yafet and Kittel ordering scheme. The experimental evidence for angular ordering schemes on the B lattice of spinels is, however, inconclusive and contradictory. Prince, for instance, has obtained neutron diffraction data on CuCr2O4 which is consistent with, but does not uniquely determine, the Yafet-Kittel scheme. Pickart, on the other hand, has found no evidence of the angular scheme in data on (MnFe2O4)1−x+(MnCr2O4)x and (NiFe2O4)1−x+(NiCr2O4)x, although he did establish that the moment of the B lattice was lower than expected on a simple Néel picture. In this report, we present a new approach to this problem which appears to lead to a reasonable, adequate, and consistent treatment of the moment data. It is usually supposed that the spin of the Cr3+ ion in the octahedral environment of the spinel B site is 32 giving a moment of three Bohr magnetons. A consideration of the crystal field theory pertinent to Cr3+ shows, however, that if the B site is given a sufficient tetragonal or trigonal distortion, the doublet state, having a spin of 12 and a moment of one Bohr magneton, becomes the ground state. It is known further that the B sites can be distorted from regular octahedral symmetry by the presence of Jahn-Teller distortions in neighboring sites. For example, Ni2+ and Cu2+ cause distortions when on A sites, while Cu2+ and Mn3+ cause distortions when on the B sites. The process by which the moment of an ion is reduced in this way is called “spin quenching.” We therefore propose that the origin of the low moments in the chromites is the spin-quenching effect imposed on the Cr3+ ions by the appropriate Jahn-Teller distortions of their neighbors. We also emphasize that a macroscopically distorted phase is not required for this effect. It is only necessary that a distribution of distorting neighbors be present, sufficient in number to alter the symmetry about (and hence spin quench) at least a fraction of the chromium ions. With the aid of these hypotheses it has proved possible to explain the moment data for many chromites in a consistent way. Of particular interest are the recently studied systems, (CuFe2O4)1−x+(CuCr2O4)x and (NiFe2O4)1−x+(NiCr2O4)x." @default.
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- W1979068362 date "1959-04-01" @default.
- W1979068362 modified "2023-09-23" @default.
- W1979068362 title "On the Origin of Low Moments in Chromium‐Containing Spinels" @default.
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- W1979068362 doi "https://doi.org/10.1063/1.2185931" @default.
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