Reduction of the Jahn-Teller distortion at the insulator-to-metal transition in mixed valence manganites
- Institut de Ciencia de Materials de Barcelona, Consejo Superior de Investigaciones Cientificas Campus, Universitat Autonoma de Barcelona, Bellaterra 08193 (Spain)
- Laboratoire de Leon-Brillouin (Commissariat a lenergie atomique-Centre National de la Recherche Scientifique), Centre dEtudes de Saclay, 91191 Gif sur Yvette Cedex (France)
The insulator-to-metal transition in the manganite La{sub 0.52}Y{sub 0.15}Ca{sub 0.33}MnO{sub 3} (T{sub IM}{approx}115 K) has been studied by high-resolution neutron powder diffraction. The cell volume contraction at the Curie point is accompanied by a remarkable decrease of the Jahn-Teller distortion in MnO{sub 6} octahedra. The change of the Mn-O bond lengths at T{sub IM} is anisotropic and brings about a drop out of the basal-plane collective distortion mode Q{sub 2}, proposed to be the deformation responsible for the band split of e{sub g{up_arrow}} orbitals. This is consistent with the double-exchange picture, and precludes simple ferromagnetic exchange. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 432523
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 55, Issue 1; Other Information: PBD: Jan 1997
- Country of Publication:
- United States
- Language:
- English
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