Quantum Ferroelectric Magnets in Underdoped Manganites

Details Quantum Ferroelectric Magnets in Underdoped Manganites Quantum Ferroelectric Magnets in Underdoped Manganites

2006-08-13

arxiv.org/abs/cond-mat/0608300v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 6 figures

Scientific paper

Using the degenerate double exchange Hamiltonian with on-site Coulomb interactions we show that there is an instability towards the displacement of the manganese ion in La_{1-x}Ca_{x}MnO_{3}. The result is a dipole moment due to the charge disproportionation and the lattice distortions that gives rise to the predicted magnetic ferroelectric phase for dopings in between x=4 and x=5. The instability is stabilized by the phonons of the lattice, resulting in a stable configuration of the degrees of freedom of the system.

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