Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-06-20
Phys. Rev. B 69, 094415 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
16 pages with 16 figures, contains a more detailed parameter estimate based on the structural data by Radaelli et al. (accepte
Scientific paper
10.1103/PhysRevB.69.094415
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 a key 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.
Bała Jan
Horsch Peter
Mack Frank
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