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Suppression of Jahn-Teller distortion and insulator-to-metal transition in LaMnO3 at high pressures

MPG-Autoren
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Loa,  I.
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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Syassen,  K.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Schwarz,  U.
Ulrich Schwarz, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Hanfland,  M.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zitation

Loa, I., Adler, P., Grzechnik, A., Syassen, K., Schwarz, U., Hanfland, M., et al. (2002). Suppression of Jahn-Teller distortion and insulator-to-metal transition in LaMnO3 at high pressures. High Pressure Research, 22(2 Sp. Iss. SI), 325-329. doi:10.1080/08957950212777.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0015-3159-F
Zusammenfassung
Structural, vibrational and electronic properties of LaMnO3 under pressures up to 38 GPa have been studied by synchrotron X-ray powder diffraction, Raman spectroscopy, optical reflectivity, and transport measurements. The cooperative Jahn- Teller distortion of the MnO6 octahedra of the perovskite-type structure is continuously suppressed with increasing pressure, a process which appears completed at similar to20 GPa. The system remains insulating to 32 GPa, where an insulator-metal transition is observed. This transition is attributed to strengthened Mn-O-Mn interactions due to the increasing overlap of atomic orbitals.