Suppression of Ferromagnetic Double Exchange by Vibronic Phase Segregation

Details Suppression of Ferromagnetic Double Exchange by Vibronic Phase Segregation Suppression of Ferromagnetic Double Exchange by Vibronic Phase Segregation

2005-09-12

arxiv.org/abs/cond-mat/0509289v2

Physics

Condensed Matter

Strongly Correlated Electrons

Replaced with the final version accepted in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.96.016402

From Raman spectroscopy, magnetization, and thermal-expansion on the system La2/3(Ca1-xSrx)1/3MnO3, we have been able to provide a quantitative basis for the heterogeneous electronic model for manganites exhibiting colossal magnetoresistance (CMR). We construct a mean-field model that accounts quantitatively for the measured deviation of TC(x) from the TC predicted by de Gennes double exchange in the adiabatic approximation, and predicts the occurrence of a first order transition for a strong coupling regime, in accordance with the experiments. The existence of a temperature interval TC

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