Hickey, P.J., Knee, C.S., Henry, P.F. and Weller, M.T.
Spin-crossover structural transition in the layered perovskite Gd2SrCo2O7
Physical Review B, 75, (2) (doi:10.1103/PhysRevB.75.024113).
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The structure of the double-layer Ruddlesden-Popper phase Gd2SrCo2O7 has been determined in the temperature range 300–973 K using powder neutron diffraction. The room-temperature structure is tetragonal and displays small tilts of the oxygen sublattice that are described in P42/mnm symmetry instead of the idealized I4/mmm structure. A structural transition at T580 K is characterized by reduction of unit cell symmetry and a marked axial elongation of the CoO6 octahedra; this behavior is associated with a spin crossover at the octahedrally coordinated cobalt (III) ions, most likely from an intermediate to a high spin configuration.
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