Spin-crossover structural transition in the layered perovskite Gd2SrCo2O7
Spin-crossover structural transition in the layered perovskite Gd2SrCo2O7
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.
neutron-diffraction, chemistry, lacoo3, state, crystal-structure, electronic-properties, transition
Hickey, P.J.
1c39efcd-8247-41d0-a0b9-828fd5b062b2
Knee, C.S.
d241249a-3d10-4b3e-9931-e3dd1029bb30
Henry, P.F.
7a749ff8-32f2-4075-9d7f-1852a62cf88e
Weller, M.T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4
21 January 2007
Hickey, P.J.
1c39efcd-8247-41d0-a0b9-828fd5b062b2
Knee, C.S.
d241249a-3d10-4b3e-9931-e3dd1029bb30
Henry, P.F.
7a749ff8-32f2-4075-9d7f-1852a62cf88e
Weller, M.T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4
Hickey, P.J., Knee, C.S., Henry, P.F. and Weller, M.T.
(2007)
Spin-crossover structural transition in the layered perovskite Gd2SrCo2O7.
Physical Review B, 75 (2).
(doi:10.1103/PhysRevB.75.024113).
Abstract
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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Submitted date: 3 July 2006
Published date: 21 January 2007
Keywords:
neutron-diffraction, chemistry, lacoo3, state, crystal-structure, electronic-properties, transition
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Local EPrints ID: 54316
URI: http://eprints.soton.ac.uk/id/eprint/54316
ISSN: 1550-235X
PURE UUID: 43d09dd3-beef-4dfa-a748-b5a82831678b
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Date deposited: 30 Jul 2008
Last modified: 15 Mar 2024 10:46
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Author:
P.J. Hickey
Author:
C.S. Knee
Author:
P.F. Henry
Author:
M.T. Weller
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