Lattice dynamics in colossal magnetoresistance manganites

B. I. Min; J. D. Lee; S. J. Youn

doi:10.1016/S0304-8853(97)00835-4

Lattice dynamics in colossal magnetoresistance manganites

B. I. Min, J. D. Lee, S. J. Youn

Department of Physics and Chemistry

Pohang University of Science and Technology

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

26 Scopus citations

Abstract

Based on the Hamiltonian of small polarons with strong electron-phonon interaction, we have investigated anomalous behaviors of the sound velocity in colossal magnetoresistance (CMR) manganese oxides. In the low-doping metallic regime, the sound velocity has been found to be hardened below the ferromagnetic transition temperature T_C due to T-dependent electron screening coming from the double exchange (DE) interaction. On the contrary, in the high-doping regime (x > 0.5), the charge ordering (CO) interaction rather than the DE induces the hardening of the sound velocity by the ordering of localized polarons around the CO transition temperature T_CO.

Original language	English
Pages (from-to)	881-883
Number of pages	3
Journal	Journal of Magnetism and Magnetic Materials
Volume	177-181
Issue number	PART 2
DOIs	https://doi.org/10.1016/S0304-8853(97)00835-4
State	Published - Jan 1998

Bibliographical note

Funding Information:
This work was supported by the POSTECH-BSRI program of the KME and also in part by the KOSEF through the SRC program of SNU-CTP.

Keywords

Charge ordering
Electron-phonon interaction
Giant magnetoresistance
Transition-metal oxides

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10.1016/S0304-8853(97)00835-4

Cite this

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title = "Lattice dynamics in colossal magnetoresistance manganites",

abstract = "Based on the Hamiltonian of small polarons with strong electron-phonon interaction, we have investigated anomalous behaviors of the sound velocity in colossal magnetoresistance (CMR) manganese oxides. In the low-doping metallic regime, the sound velocity has been found to be hardened below the ferromagnetic transition temperature TC due to T-dependent electron screening coming from the double exchange (DE) interaction. On the contrary, in the high-doping regime (x > 0.5), the charge ordering (CO) interaction rather than the DE induces the hardening of the sound velocity by the ordering of localized polarons around the CO transition temperature TCO.",

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T1 - Lattice dynamics in colossal magnetoresistance manganites

AU - Min, B. I.

AU - Lee, J. D.

AU - Youn, S. J.

N1 - Funding Information: This work was supported by the POSTECH-BSRI program of the KME and also in part by the KOSEF through the SRC program of SNU-CTP.

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N2 - Based on the Hamiltonian of small polarons with strong electron-phonon interaction, we have investigated anomalous behaviors of the sound velocity in colossal magnetoresistance (CMR) manganese oxides. In the low-doping metallic regime, the sound velocity has been found to be hardened below the ferromagnetic transition temperature TC due to T-dependent electron screening coming from the double exchange (DE) interaction. On the contrary, in the high-doping regime (x > 0.5), the charge ordering (CO) interaction rather than the DE induces the hardening of the sound velocity by the ordering of localized polarons around the CO transition temperature TCO.

AB - Based on the Hamiltonian of small polarons with strong electron-phonon interaction, we have investigated anomalous behaviors of the sound velocity in colossal magnetoresistance (CMR) manganese oxides. In the low-doping metallic regime, the sound velocity has been found to be hardened below the ferromagnetic transition temperature TC due to T-dependent electron screening coming from the double exchange (DE) interaction. On the contrary, in the high-doping regime (x > 0.5), the charge ordering (CO) interaction rather than the DE induces the hardening of the sound velocity by the ordering of localized polarons around the CO transition temperature TCO.

KW - Charge ordering

KW - Electron-phonon interaction

KW - Giant magnetoresistance

KW - Transition-metal oxides

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U2 - 10.1016/S0304-8853(97)00835-4

DO - 10.1016/S0304-8853(97)00835-4

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VL - 177-181

SP - 881

EP - 883

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - PART 2

ER -

Lattice dynamics in colossal magnetoresistance manganites

Abstract

Bibliographical note

Keywords

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