Peierls Instability Induced Ferromagnetic Insulator at Orbital Order Transition

D. Hou; J. H Wei; X. R. Wang

Peierls Instability Induced Ferromagnetic Insulator at Orbital Order Transition

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arxiv 0811.2019 v2 pith:D3YCSJJS submitted 2008-11-13 cond-mat.mtrl-sci

J. H Wei , D. Hou , X. R. Wang This is my paper · ORCID

classification cond-mat.mtrl-sci

keywords ferromagneticstateinstabilityorbitalpeierlsarisenattributeddoped

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abstract

The origin of ferromagnetic insulating state of La$_{7/8}$Sr$_{1/8}$MnO$_3$ is investigated. Based on the tight-binding model, it is shown that this state can be attributed to the Peierls instability arisen from the interplay of spin and orbital ordering. The importance of the hole-orbiton-phonon intercoupling in doped manganites is revealed. This picture explains well the recent experimental finding of the reentrance of ferromagnetic metal state at low temperature [Phys. Rev. Lett. 96, 097201 (2006)].

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