Lattice dynamics and charge ordering in La1-xCaxMnO3 (0.45≤x≤0.76)

S. Naler; M. Rübhausen; S. Yoon; S Lance Cooper; K. H. Kim; S. W. Cheong

Lattice dynamics and charge ordering in La_1-xCa_xMnO₃ (0.45≤x≤0.76)

S. Naler, M. Rübhausen, S. Yoon, S Lance Cooper, K. H. Kim, S. W. Cheong

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

Abstract

We study local lattice fluctuations in La_1-xCa_xMnO₃ (0.45≤x≤0.76) by means of inelastic light scattering. Fluctuation effects are especially strong in the intensity variation of Jahn-Teller mode at 480 cm^-1 around commensurate doping x≈0.5. The linewidth of the Jahn-Teller mode shows a minimum at x = 0.50 indicating "long-range" lattice and charge commensuration at low temperatures. The electron-phonon interaction is fundamentally changed at the transition to the charge-ordered (CO) state as evidenced by sign and magnitude changes in the Fano parameter. Temperature-dependent data show enhanced fluctuations persisting up to temperatures of at least 2 T_co for x ≈ 0.50.

Original language	English (US)
Article number	092401
Pages (from-to)	924011-924014
Number of pages	4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	65
Issue number	9
State	Published - Mar 1 2002

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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abstract = "We study local lattice fluctuations in La1-xCaxMnO3 (0.45≤x≤0.76) by means of inelastic light scattering. Fluctuation effects are especially strong in the intensity variation of Jahn-Teller mode at 480 cm-1 around commensurate doping x≈0.5. The linewidth of the Jahn-Teller mode shows a minimum at x = 0.50 indicating {"}long-range{"} lattice and charge commensuration at low temperatures. The electron-phonon interaction is fundamentally changed at the transition to the charge-ordered (CO) state as evidenced by sign and magnitude changes in the Fano parameter. Temperature-dependent data show enhanced fluctuations persisting up to temperatures of at least 2 Tco for x ≈ 0.50.",

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T1 - Lattice dynamics and charge ordering in La1-xCaxMnO3 (0.45≤x≤0.76)

AU - Naler, S.

AU - Rübhausen, M.

AU - Yoon, S.

AU - Cooper, S Lance

AU - Kim, K. H.

AU - Cheong, S. W.

PY - 2002/3/1

Y1 - 2002/3/1

N2 - We study local lattice fluctuations in La1-xCaxMnO3 (0.45≤x≤0.76) by means of inelastic light scattering. Fluctuation effects are especially strong in the intensity variation of Jahn-Teller mode at 480 cm-1 around commensurate doping x≈0.5. The linewidth of the Jahn-Teller mode shows a minimum at x = 0.50 indicating "long-range" lattice and charge commensuration at low temperatures. The electron-phonon interaction is fundamentally changed at the transition to the charge-ordered (CO) state as evidenced by sign and magnitude changes in the Fano parameter. Temperature-dependent data show enhanced fluctuations persisting up to temperatures of at least 2 Tco for x ≈ 0.50.

AB - We study local lattice fluctuations in La1-xCaxMnO3 (0.45≤x≤0.76) by means of inelastic light scattering. Fluctuation effects are especially strong in the intensity variation of Jahn-Teller mode at 480 cm-1 around commensurate doping x≈0.5. The linewidth of the Jahn-Teller mode shows a minimum at x = 0.50 indicating "long-range" lattice and charge commensuration at low temperatures. The electron-phonon interaction is fundamentally changed at the transition to the charge-ordered (CO) state as evidenced by sign and magnitude changes in the Fano parameter. Temperature-dependent data show enhanced fluctuations persisting up to temperatures of at least 2 Tco for x ≈ 0.50.

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Lattice dynamics and charge ordering in La_1-xCa_xMnO₃ (0.45≤x≤0.76)

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