Quantum Treatment of the Anderson-Hasegawa Model -- Effects of Superexchange and Polarons

Details Quantum Treatment of the Anderson-Hasegawa Model -- Effects of Superexchange and Polarons Quantum Treatment of the Anderson-Hasegawa Model -- Effects of Superexchange and Polarons

2002-04-17

arxiv.org/abs/cond-mat/0204360v1

Physics

Condensed Matter

18 pages, Revtex, 7 postscript figures

Scientific paper

We revisit the Anderson-Hasegawa double-exchange model and critically examine its exact solution when the core spins are treated quantum mechanically.We show that the quantum effects, in the presence of an additional superexchange interaction between the core spins, yield a term, the significance of which has been hitherto ignored. The quantum considerations further lead to new results when polaronic effects, believed to be ubiquitous in manganites due to electron-phonon coupling, are included. The consequence of these results for the magnetic phase diagrams and the thermal heat capacity is also carefully analysed.

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