Role of orbital correlation in colossal magnetoresistance

Eiji Saitoh; Y. Tomioka; T. Kimura; Y. Tokura

doi:10.1016/S0304-8853(01)00570-4

Role of orbital correlation in colossal magnetoresistance

Eiji Saitoh, Y. Tomioka, T. Kimura, Y. Tokura

Advanced Institute for Materials Research (AIMR)

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

7 Citations (Scopus)

Abstract

Raman scattering has been investigated for a single crystal of Sm_1-xSr_xMnO₃ (x = 0.45), which shows prototypical colossal magnetoresistance (CMR), and related crystals. The emergence of broad phonon bands indicates dynamical charge/orbital correlation above the Curie temperature. Such a feature is systematically enhanced with a decrease of one-electron band width toward the orbital order-disorder phase boundary, being concomitant with the enhancement of CMR. The charge/orbital correlation affected by charge/orbital ordering instability is likely to be responsible for the steep insulator-metal transition and CMR.

Original language	English
Pages (from-to)	170-172
Number of pages	3
Journal	Journal of Magnetism and Magnetic Materials
Volume	239
Issue number	1-3
DOIs	https://doi.org/10.1016/S0304-8853(01)00570-4
Publication status	Published - 2002 Feb 1

Keywords

Colossal magnetoresistance
Manganese oxides
Raman scattering

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1016/S0304-8853(01)00570-4

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title = "Role of orbital correlation in colossal magnetoresistance",

abstract = "Raman scattering has been investigated for a single crystal of Sm1-xSrxMnO3 (x = 0.45), which shows prototypical colossal magnetoresistance (CMR), and related crystals. The emergence of broad phonon bands indicates dynamical charge/orbital correlation above the Curie temperature. Such a feature is systematically enhanced with a decrease of one-electron band width toward the orbital order-disorder phase boundary, being concomitant with the enhancement of CMR. The charge/orbital correlation affected by charge/orbital ordering instability is likely to be responsible for the steep insulator-metal transition and CMR.",

keywords = "Colossal magnetoresistance, Manganese oxides, Raman scattering",

author = "Eiji Saitoh and Y. Tomioka and T. Kimura and Y. Tokura",

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T1 - Role of orbital correlation in colossal magnetoresistance

AU - Saitoh, Eiji

AU - Tomioka, Y.

AU - Kimura, T.

AU - Tokura, Y.

PY - 2002/2/1

Y1 - 2002/2/1

N2 - Raman scattering has been investigated for a single crystal of Sm1-xSrxMnO3 (x = 0.45), which shows prototypical colossal magnetoresistance (CMR), and related crystals. The emergence of broad phonon bands indicates dynamical charge/orbital correlation above the Curie temperature. Such a feature is systematically enhanced with a decrease of one-electron band width toward the orbital order-disorder phase boundary, being concomitant with the enhancement of CMR. The charge/orbital correlation affected by charge/orbital ordering instability is likely to be responsible for the steep insulator-metal transition and CMR.

AB - Raman scattering has been investigated for a single crystal of Sm1-xSrxMnO3 (x = 0.45), which shows prototypical colossal magnetoresistance (CMR), and related crystals. The emergence of broad phonon bands indicates dynamical charge/orbital correlation above the Curie temperature. Such a feature is systematically enhanced with a decrease of one-electron band width toward the orbital order-disorder phase boundary, being concomitant with the enhancement of CMR. The charge/orbital correlation affected by charge/orbital ordering instability is likely to be responsible for the steep insulator-metal transition and CMR.

KW - Colossal magnetoresistance

KW - Manganese oxides

KW - Raman scattering

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