Phys. Rev. Lett. 95, 026401 (2005) [4 pages]Ferro-Type Orbital State in the Mott Transition System Ca2-xSrxRuO4 Studied by the Resonant X-Ray Scattering Interference TechniqueReceived 10 January 2005; published 5 July 2005 We have succeeded in detecting ferro-type orbital states in Ca2-xSrxRuO4, which is the first outcome in a 4d Mott transition system by the resonant x-ray scattering interference technique. For x=0 (Mott insulator), the resonant signal for dxy orbital ordering is observed even at room temperature, in which the Jahn-Teller distortion is negligible. The signal disappears near the metal-insulator transition. On the other hand, in a metallic phase for x=0.5, orbital polarization with dyz/zx character dominates. With lowering temperature, the magnitude of the resonant signal slightly decreases owing to the additional influence of the γ band with dxy character. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.026401
DOI:
10.1103/PhysRevLett.95.026401
PACS:
71.30.+h, 61.10.Dp, 61.10.Eq, 71.27.+a
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