Orbital order induced metal-insulator transition in (La,Ca)MnO3

Details Orbital order induced metal-insulator transition in (La,Ca)MnO3 Orbital order induced metal-insulator transition in (La,Ca)MnO3

2002-04-04

arxiv.org/abs/cond-mat/0204103v1

Phys. Rev. Lett. 90, 066403 (2003)

Physics

Condensed Matter

Materials Science

5 pages, including 5 figures

Scientific paper

10.1103/PhysRevLett.90.066403

We present evidence that the insulator to metal transition in (La,Ca)MnO3 near x~0.2 is driven by the suppression of coherent Jahn-Teller distortions, originating from d type orbital ordering. The orbital ordered state is characterised by large long-range Q2 distortions below To*-o'. Above To*-o' we find evidence for coexistence between an orbital-ordered and -disordered state. This behaviour is discussed in terms of electronic phases of an orbital ordered insulating and orbital-disordered metallic states.

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