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

doi:10.1103/PhysRevLett.82.4328

Transition between Two Ferromagnetic States Driven by Orbital Ordering in La_0.88 Sr_0.12 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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Abstract

A lightly doped manganite La 0.88 Sr 0.12 MnO 3 exhibits a phase transition at T_OO= 145 K from a ferromagnetic metal (T_C = 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 T_OOin 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 language	English
Pages (from-to)	4328-4331
Number of pages	4
Journal	Physical Review Letters
Volume	82
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevLett.82.4328
State	Published - 1999
Externally published	Yes

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

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.",

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T1 - Transition between Two Ferromagnetic States Driven by Orbital Ordering in La0.88 Sr0.12 MnO3

AU - Endoh, Y.

AU - Hirota, K.

AU - Ishihara, S.

AU - Okamoto, S.

AU - Murakami, Y.

AU - Nishizawa, A.

AU - Fukuda, T.

AU - Kimura, H.

AU - Nojiri, H.

AU - Kaneko, K.

AU - Maekawa, S.

PY - 1999

Y1 - 1999

N2 - 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.

AB - 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.

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DO - 10.1103/PhysRevLett.82.4328

M3 - Article

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JO - Physical Review Letters

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Transition between Two Ferromagnetic States Driven by Orbital Ordering in La_0.88 Sr_0.12 MnO₃

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