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

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

2011-10-12

arxiv.org/abs/1110.2667v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 4 figures

Scientific paper

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 signi?cant reduction of the JT distortion. This entails band-overlap as the driving mechanism of the IM transition.

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