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García-Fernández, M; Staub, U; Bodenthin, Y; Scagnoli, V; Pomjakushin, V; Lovesey, S W; Mirone, A; Herrero-Martín, J; Piamonteze, C; Pomjakushina, E
Physical review letters, 08/2009, Letnik: 103, Številka: 9Journal Article
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 L(2,3) and O K edges, provides direct evidence for orbital order at Mn(3+) and oxygen sites and absence of Zener polaron formation. For x > or = 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.
