Origin of the non-linear pressure effects in perovskite manganites: Buckling of MnOMn bonds and JahnTeller distortion of the MnO6 octahedra induced by pressure

Document Type

Article

Publication Date

10-1-2010

Abstract

High-pressure resistivity and X-ray diffraction measurements were conducted on La0.85MnO3-δ at ∼6 and ∼7 GPa, respectively. At low pressures the metalinsulator transition temperature (T MI) increases linearly up to a critical pressure, P (*) ∼3.4 GPa, followed by reduction in TMI at higher pressure. Analysis of the bond distances and bond angles reveals that a bandwidth increase drives the increase in TMI below P (*). The reduction in TMI at higher pressures is found to result from JahnTeller distortions of the MnO6 octahedra. The role of anharmonic interatomic potentials is discussed. © 2010 Elsevier B.V.

Identifier

77955304473 (Scopus)

Publication Title

Journal of Magnetism and Magnetic Materials

External Full Text Location

https://doi.org/10.1016/j.jmmm.2010.05.027

ISSN

03048853

First Page

3049

Last Page

3052

Issue

20

Volume

322

Grant

DMR-0512196

Fund Ref

National Science Foundation

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