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Influence of O2 molecular orientation on p-orbital ordering and exchange pathways in Cs4O6

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Sans,  A.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Adler,  P.
Peter Adler, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Schnelle,  W.
Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Jansen,  M.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser,  C.
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Arčon, D., Anderle, K., Klanjšek, M., Sans, A., Mühle, C., Adler, P., et al. (2013). Influence of O2 molecular orientation on p-orbital ordering and exchange pathways in Cs4O6. Physical Review B, 88(22): 224409, pp. 1-7. doi:10.1103/PhysRevB.88.224409.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0017-C0D4-1
Abstract
The coupling of charge, lattice, orbital, and spin degrees of freedom was studied in a p-electron mixed-valence Cs4O6 compound by the electron paramagnetic resonance (EPR) and Cs-133 nuclear magnetic resonance (NMR). The dramatic differences in the evolution of the EPR and Cs-133 NMR spectra measured under different cooling protocols reveal two competing low-temperature phases: quenched high-temperature cubic and the low-temperature low-symmetry phases, respectively. They differ in the orientation of O-2(-) anion axes, the ordering of p* molecular orbitals, and the superexchange interactions through the Cs+ bridges. The transformation between the two phases involves large amplitude reorientations of O-2 groups and is extremely sluggish, thus explaining the coexistence of both phases and the deviations of the magnetic susceptibility from the simple Curie-Weiss dependence at low temperatures.