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Bandwidth-driven nature of the pressure-induced metal state of LaMnO3

Using X-ray absorption spectroscopy (XAS), we studied the local structure in LaMnO3 under applied pressure across and well above the insulator to metal (IM) transition. A hysteretic behavior points to the coexistence of two phases within a large pressure range (7 to 25 GPa). The ambient phase with highly Jahn-Teller (JT) distorted MnO6 octahedra is progressively substituted by a new phase with less-distorted JT MnO6 units. The electronic delocalization leading to the IM transition is finger-printed from the pre-edge XAS structure around 30 GPa. We observed that the phase transition takes place without any significant reduction of the JT distortion. This entails band-overlap as the driving mechanism of the IM transition.

preprint2011arXivOpen access
Aline Y. RamosNarcizo M. Souza-NetoHelio C. N. TolentinoOana BunauYves JolyStephane GrenierJean-Paul ItieAnne-Marie FlankPierre LagardeAlberto Caneiro
cond-mat.str-el
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Aline Y. RamosNarcizo M. Souza-NetoHelio C. N. TolentinoOana BunauYves JolyStephane GrenierJean-Paul ItieAnne-Marie FlankPierre LagardeAlberto Caneiro

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