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

Z. Chen; T. A. Tyson; K. H. Ahn; Z. Zhong; J. Hu

doi:10.1016/j.jmmm.2010.05.027

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

Z. Chen, T. A. Tyson, K. H. Ahn, Z. Zhong, J. Hu

Physics

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

High-pressure resistivity and X-ray diffraction measurements were conducted on La_0.85MnO_3-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 T_MI at higher pressure. Analysis of the bond distances and bond angles reveals that a bandwidth increase drives the increase in T_MI below P ^(*). The reduction in T_MI at higher pressures is found to result from JahnTeller distortions of the MnO₆ octahedra. The role of anharmonic interatomic potentials is discussed.

Original language	English (US)
Pages (from-to)	3049-3052
Number of pages	4
Journal	Journal of Magnetism and Magnetic Materials
Volume	322
Issue number	20
DOIs	https://doi.org/10.1016/j.jmmm.2010.05.027
State	Published - Oct 2010

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Keywords

High pressure
Metalinsulator transition
Perovskite manganite

Access to Document

10.1016/j.jmmm.2010.05.027

Cite this

@article{72187f72b02440b9b451748a6ed031eb,

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

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.",

keywords = "High pressure, Metalinsulator transition, Perovskite manganite",

author = "Z. Chen and Tyson, {T. A.} and Ahn, {K. H.} and Z. Zhong and J. Hu",

note = "Funding Information: We are indebted to Prof. J.B. Goodenough (University of Texas at Austin) for important contributions to the discussions on the pressure dependence of the bandwidth. The high-pressure X-ray diffraction measurements were conducted at Brookhaven National Laboratory{\textquoteright}s NSLS beamline X17B1. This research was funded by NSF DMR-0512196.",

year = "2010",

month = oct,

doi = "10.1016/j.jmmm.2010.05.027",

language = "English (US)",

volume = "322",

pages = "3049--3052",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier B.V.",

number = "20",

}

TY - JOUR

T1 - Origin of the non-linear pressure effects in perovskite manganites

T2 - Buckling of MnOMn bonds and JahnTeller distortion of the MnO6 octahedra induced by pressure

AU - Chen, Z.

AU - Tyson, T. A.

AU - Ahn, K. H.

AU - Zhong, Z.

AU - Hu, J.

N1 - Funding Information: We are indebted to Prof. J.B. Goodenough (University of Texas at Austin) for important contributions to the discussions on the pressure dependence of the bandwidth. The high-pressure X-ray diffraction measurements were conducted at Brookhaven National Laboratory’s NSLS beamline X17B1. This research was funded by NSF DMR-0512196.

PY - 2010/10

Y1 - 2010/10

N2 - 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.

AB - 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.

KW - High pressure

KW - Metalinsulator transition

KW - Perovskite manganite

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