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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2007

Stability of Jahn Teller distortion in LaMnO3 under pressure: An x-ray absorption study

Résumé

The local environment of manganese atoms in LaMnO3 under pressure up to 15.3 GPa has been studied by x-ray absorption spectroscopy. For pressures below 8 GPa, no change is detected within the MnO6 octahedra. Above this pressure a continuous reduction of the long Mn-O distance takes place, however the octahedral distortion persists over the whole pressure range. At 15.3 GPa the average Jahn-Teller splitting of the distances is reduced by about one third, indicating that a total removal of the local Jahn-Teller distortion would occur only for pressures around 30 GPa, where metallization is reported to take place. A hysteresis in the long distance reduction is observed down to ambient pressure, suggesting the coexistence of MnO6 distorted and undistorted units.
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Dates et versions

hal-00128117 , version 1 (30-01-2007)

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Aline Y. Ramos, Hélio Tolentino, Narcizo M. Souza-Neto, Jean-Paul Itié, Liliana Morales, et al.. Stability of Jahn Teller distortion in LaMnO3 under pressure: An x-ray absorption study. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2007, 75, pp.052103. ⟨10.1103/PhysRevB.75.052103⟩. ⟨hal-00128117⟩
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