Transition between Two Ferromagnetic States Driven by Orbital Ordering in La0.88 Sr0.12 MnO3

Y. Endoh, K. Hirota, S. Ishihara, S. Okamoto, Y. Murakami, A. Nishizawa, T. Fukuda, H. Kimura, H. Nojiri, K. Kaneko, S. Maekawa

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277 Citations (Scopus)

Abstract

A lightly doped manganite La 0.88 Sr 0.12 MnO 3 exhibits a phase transition at TOO= 145 K from a ferromagnetic metal (TC = 172 K) to a novel ferromagnetic insulator. We identify that the key parameter in the transition is the orbital degree of freedom in e g electrons. By utilizing the resonant x-ray scattering, orbital ordering is directly detected below TOOin spite of a significant diminution of the cooperative Jahn-Teller distortion. The experimental features are well described by a theory treating the orbital degree of freedom under strong electron correlation. The present studies uncover a crucial role of the orbital degree of freedom in the metal-insulator transition in lightly doped manganites.

Original languageEnglish
Pages (from-to)4328-4331
Number of pages4
JournalPhysical review letters
Volume82
Issue number21
DOIs
Publication statusPublished - 1999

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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