Study of the ferromagnetic-insulator phase in manganites
Strongly Correlated Electrons
2018-05-15 v1
Abstract
Understanding the coexistence of ferromagnetism and insulating behavior in manganites is an unsolved problem. We propose a localized-band model involving effective intermediate-range electron-electron (electron-hole) repulsion (attraction) generated by cooperative electron-phonon interaction. Double exchange mechanism, involving holes virtually hopping to nearest neighbors and back, produces magnetic polarons in an antiferromagnetic environment; when these magnetic polarons coalesce and percolate the system, we get a ferromagnetic insulator. Ferromagnetism gets more pronounced when the holes (doping) increases or when the ratio hopping/polaronic-energy dominates over superexchange-coupling/hopping.
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Cite
@article{arxiv.1805.05172,
title = {Study of the ferromagnetic-insulator phase in manganites},
author = {Sanjukta Paul and Sudhakar Yarlagadda},
journal= {arXiv preprint arXiv:1805.05172},
year = {2018}
}
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11 figures