Buckling induced Zener polaron instability in half-doped manganites

Details Buckling induced Zener polaron instability in half-doped manganites Buckling induced Zener polaron instability in half-doped manganites

2011-03-24

arxiv.org/abs/1103.4804v2

Physical Review B 83, 233103 (2011);

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

By calculating the electronic, orbital, magnetic and lattice structure of half-doped manganites we establish the central role of oxygen buckling caused by the tilting of the MnO$_6$ octahedra -- in essence a steric effect. The buckling itself does not change the Mn-Mn bonds. Instead it drives the system towards an instability where these bonds can dimerize. In presence of electron-electron interactions, this instability can fully develop and beyond a critical buckling a Zener polaron groundstate with dimerized spins, lattice and orbitals forms spontaneously, resulting in a multiferroic state.

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