Orbital ordering and strong correlations in manganites

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@article{6a01e00617354a1b82baf2891bd5d254,
title = "Orbital ordering and strong correlations in manganites",
abstract = "We investigate the doped perovskite manganites by using some elementary strong-correlation models. We focus mainly on the electronic motion through double-exchange and include the spin and lattice fluctuations solely to lift any residual degeneracy. We consider the low-energy physics of the strong-coupling limit, incorporating the spatial structure of the orbitals carefully. Due to a mismatch between the point-symmetries of the orbitals and the lattice, we find a highly geometrically frustrated Hubbard-like model. When orbital superexchange is dominant, the system finds ordering very difficult, and when the charge-carrier motion is dominant, the styles of orbital order are expected to be fairly complicated. Unless the system exhibits Fermi-liquid behaviour, the strong correlations are suggested to be uncontrollable at present.",
author = "Martin Long",
year = "1998",
month = jul,
day = "15",
doi = "10.1098/rsta.1998.0232",
language = "English",
volume = "356",
pages = "1493--1515",
journal = "Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences ",
issn = "0264-3952",
publisher = "The Royal Society",
number = "1742",

}

RIS

TY - JOUR

T1 - Orbital ordering and strong correlations in manganites

AU - Long, Martin

PY - 1998/7/15

Y1 - 1998/7/15

N2 - We investigate the doped perovskite manganites by using some elementary strong-correlation models. We focus mainly on the electronic motion through double-exchange and include the spin and lattice fluctuations solely to lift any residual degeneracy. We consider the low-energy physics of the strong-coupling limit, incorporating the spatial structure of the orbitals carefully. Due to a mismatch between the point-symmetries of the orbitals and the lattice, we find a highly geometrically frustrated Hubbard-like model. When orbital superexchange is dominant, the system finds ordering very difficult, and when the charge-carrier motion is dominant, the styles of orbital order are expected to be fairly complicated. Unless the system exhibits Fermi-liquid behaviour, the strong correlations are suggested to be uncontrollable at present.

AB - We investigate the doped perovskite manganites by using some elementary strong-correlation models. We focus mainly on the electronic motion through double-exchange and include the spin and lattice fluctuations solely to lift any residual degeneracy. We consider the low-energy physics of the strong-coupling limit, incorporating the spatial structure of the orbitals carefully. Due to a mismatch between the point-symmetries of the orbitals and the lattice, we find a highly geometrically frustrated Hubbard-like model. When orbital superexchange is dominant, the system finds ordering very difficult, and when the charge-carrier motion is dominant, the styles of orbital order are expected to be fairly complicated. Unless the system exhibits Fermi-liquid behaviour, the strong correlations are suggested to be uncontrollable at present.

U2 - 10.1098/rsta.1998.0232

DO - 10.1098/rsta.1998.0232

M3 - Article

VL - 356

SP - 1493

EP - 1515

JO - Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences

JF - Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences

SN - 0264-3952

IS - 1742

ER -