Quantum Ferroelectric Magnets in Underdoped Manganites

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 ri...

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Bibliographic Details
Published inarXiv.org
Main Author Sanchez Guajardo, E R
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 13.08.2006
Subjects
Calcium
Dipole moments
Disproportionation
Ferroelectric materials
Ferroelectricity
Magnets
Manganese ions
Stability
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Summary: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.
ISSN:2331-8422