High pressure and isotope effects on polaron hopping in La0.65Ca0.35MnO3

B. Lorenz; A. K. Heilman; Y. S. Wang; Y. Y. Xue; C. W. Chu; G. Zhang; J. P. Franck

doi:10.1103/physrevb.63.144405

High pressure and isotope effects on polaron hopping in La_0.65Ca_0.35MnO₃

B. Lorenz, A. K. Heilman, Y. S. Wang, Y. Y. Xue, C. W. Chu, G. Zhang, J. P. Franck

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Abstract

We have measured the oxygen isotope effect on the metal-insulator transition and the electrical properties of La_0.65Ca_0.35MnO₃ under hydrostatic pressure up to 1.7 GPa. The conductivity activation energy E_A in the insulating phase is a linear function of T_c and coincides for both isotopes ¹⁶O and ¹⁸O if compared at different pressures but for the same T_c. The pressure and isotope effects can be qualitatively understood in terms of the double exchange model and the adiabatic hopping of Jahn-Teller polarons. Higher order corrections to the Holstein model in the intermediate coupling regime explain the unusually large isotope effect on the relative pressure coefficient of T^c.

Original language	English
Article number	144405
Pages (from-to)	1444051-1444056
Number of pages	6
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	63
Issue number	14
DOIs	https://doi.org/10.1103/physrevb.63.144405
Publication status	Published - 2001

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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abstract = "We have measured the oxygen isotope effect on the metal-insulator transition and the electrical properties of La0.65Ca0.35MnO3 under hydrostatic pressure up to 1.7 GPa. The conductivity activation energy EA in the insulating phase is a linear function of Tc and coincides for both isotopes 16O and 18O if compared at different pressures but for the same Tc. The pressure and isotope effects can be qualitatively understood in terms of the double exchange model and the adiabatic hopping of Jahn-Teller polarons. Higher order corrections to the Holstein model in the intermediate coupling regime explain the unusually large isotope effect on the relative pressure coefficient of Tc.",

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T1 - High pressure and isotope effects on polaron hopping in La0.65Ca0.35MnO3

AU - Lorenz, B.

AU - Heilman, A. K.

AU - Wang, Y. S.

AU - Xue, Y. Y.

AU - Chu, C. W.

AU - Zhang, G.

AU - Franck, J. P.

PY - 2001

Y1 - 2001

N2 - We have measured the oxygen isotope effect on the metal-insulator transition and the electrical properties of La0.65Ca0.35MnO3 under hydrostatic pressure up to 1.7 GPa. The conductivity activation energy EA in the insulating phase is a linear function of Tc and coincides for both isotopes 16O and 18O if compared at different pressures but for the same Tc. The pressure and isotope effects can be qualitatively understood in terms of the double exchange model and the adiabatic hopping of Jahn-Teller polarons. Higher order corrections to the Holstein model in the intermediate coupling regime explain the unusually large isotope effect on the relative pressure coefficient of Tc.

AB - We have measured the oxygen isotope effect on the metal-insulator transition and the electrical properties of La0.65Ca0.35MnO3 under hydrostatic pressure up to 1.7 GPa. The conductivity activation energy EA in the insulating phase is a linear function of Tc and coincides for both isotopes 16O and 18O if compared at different pressures but for the same Tc. The pressure and isotope effects can be qualitatively understood in terms of the double exchange model and the adiabatic hopping of Jahn-Teller polarons. Higher order corrections to the Holstein model in the intermediate coupling regime explain the unusually large isotope effect on the relative pressure coefficient of Tc.

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High pressure and isotope effects on polaron hopping in La_0.65Ca_0.35MnO₃

Abstract

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