TY - JOUR
T1 - Spin-crossover structural transition in the layered perovskite Gd2SrCo2O7
AU - Hickey, Peter J.
AU - Knee, Christopher S.
AU - Henry, Paul F.
AU - Weller, Mark T.
PY - 2007
Y1 - 2007
N2 - The structure of the double-layer Ruddlesden-Popper phase Gd2 Sr Co2 O7 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 P 42 /mnm symmetry instead of the idealized I4/mmm structure. A structural transition at T≈580 K is characterized by reduction of unit cell symmetry and a marked axial elongation of the Co O6 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.
AB - The structure of the double-layer Ruddlesden-Popper phase Gd2 Sr Co2 O7 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 P 42 /mnm symmetry instead of the idealized I4/mmm structure. A structural transition at T≈580 K is characterized by reduction of unit cell symmetry and a marked axial elongation of the Co O6 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.
UR - http://www.scopus.com/inward/record.url?scp=33846448160&partnerID=8YFLogxK
UR - http://dx.doi.org/10.1103/PhysRevB.75.024113
U2 - 10.1103/PhysRevB.75.024113
DO - 10.1103/PhysRevB.75.024113
M3 - Article
AN - SCOPUS:33846448160
VL - 75
JO - Physical Review B : Condensed Matter and Materials Physics
JF - Physical Review B : Condensed Matter and Materials Physics
SN - 1098-0121
IS - 2
M1 - 024113
ER -