Phys. Rev. Lett. 103, 097205 (2009) [4 pages]Orbital Order at Mn and O Sites and Absence of Zener Polaron Formation in ManganitesReceived 5 June 2009; published 28 August 2009 We report the doping dependence of the ground state of A-site ordered manganites below and above half doping. Energy and polarization dependence of the orbital reflection, taken by resonant soft-x-ray powder diffraction, at both Mn L2,3 and O K edges, provides direct evidence for orbital order at Mn3+ and oxygen sites and absence of Zener polaron formation. For x≥0.2 anomalous melting of the orbital order is observed, which is coupled neither to magnetic ordering nor to a structural transition, indicating a two-dimensional character of the interactions. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.097205
DOI:
10.1103/PhysRevLett.103.097205
PACS:
75.25.+z, 71.30.+h, 75.47.Lx
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