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A lightly doped perovskite mangantite La_{0.88}Sr_{0.12}MnO_3 exhibits aphase transition at T_{OO}=145 K from a ferromagnetic metal (T_C=172 K) to anovel ferromagnetic insulator.We identify that the key parameter in thetransition is the orbital degree of freedom in e_g electrons. By utilizing theresonant x-ray scattering technique, orbital ordering is directly detectedbelow T_{OO}, in spite of a significant diminution of the cooperativeJahn-Teller distortion. The new experimental features are well described by atheory treating the orbital degree of freedom under strong electroncorrelation. The present experimental and theoretical studies uncover a crucialrole of the orbital degree in the metal-insulator transition in lightly dopedmanganites.Comment: 4 pages, 4 figure

physical review letters

Transition between Two Ferromagnetic States Driven by Orbital Ordering in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>0.88</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.12</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">MnO…

Transition between Two Ferromagnetic States Driven by Orbital Ordering inLa0.88Sr0.12MnO…