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Manganites at quarter filling: Role of Jahn-Teller interactions

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Bała,  J.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Horsch,  P.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Mack,  F.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Bała, J., Horsch, P., & Mack, F. (2004). Manganites at quarter filling: Role of Jahn-Teller interactions. Physical Review B, 69(9): 094415.


Cite as: https://hdl.handle.net/21.11116/0000-000E-FB8E-8
Abstract
We have analyzed different correlation functions in a realistic
spin-orbital model for half-doped manganites. Using a
finite-temperature diagonalization technique the CE phase was found in
the charge-ordered phase in the case of small antiferromagnetic
interactions between t(2g) electrons. It is shown that the ingredient
responsible for stabilization of the CE-type spin and orbital-ordered
state is the cooperative Jahn-Teller (JT) interaction between
next-nearest Mn+3 neighbors mediated by the breathing mode distortion
of Mn+4 octahedra and displacements of Mn+4 ions. The topological phase
factor in the Mn-Mn hopping leading to gap formation in one-dimensional
models for the CE phase as well as the nearest neighbor JT coupling are
not able to produce the zigzag chains typical for the CE phase in our
model.