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- W1990542070 abstract "Abstract Salts with formulae A2CrX4-yYy, where A = K+, Rb+, Cs+, RNH3 + (R = alkyl or aryl) X = Cl, Y = Br, have layer structures based on that of K2NiF4. Near neighbour exchange in the two-dimensionally infinite CrX2 lattice is ferromagnetic because of ‘orbital ordering’ induced by a cooperative Jahn-Teller distortion of X around the high spin 3d4 Cr(II). Curie temperatures (3D ordering) vary from 35–60 K with A, X and Y, though the ratio of intra- to interplanar exchange constants is at least 103. Inter-layer exchange can be tuned by varying the distance between the layers or the axial halide ligands. For the prototype compound Rb2CrCl4, polarized neutron diffraction has given information on the orbital occupancies that give rise to the ferromagnetic exchange, and optical experiments at very low temperatures (0.3 K) show how the spin-forbidden ligand field transitions in the visible couple to spin-waves in the ferromagnetic lattice." @default.
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- W1990542070 date "1989-11-01" @default.
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- W1990542070 title "Ferromagnetism in Two-Dimensional Cr(II) Halide Salts: Neutron Scattering and Optical Experiments" @default.
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- W1990542070 doi "https://doi.org/10.1080/00268948908037502" @default.
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