Orbital order at Mn and O sites and absence of zener polaron formation in manganites

DOI: 10.1103/PhysRevLett.103.097205
PMID: 19792826

Authors: M. García-Fernández (Swiss Light Source) , Y. Bodenthin (Swiss Light Source) , V. Pomjakushin (Paul Scherrer Institut and ETH Zürich) , S. W. Lovesey (ISIS Facility; Diamond Light Source) , A. Mirone (European Synchrotron Radiation Facility,) , J. Herrero-Martín (European Synchrotron Radiation Facility,) , C. Piamonteze (Swiss Light Source) , E. Pomjakushina (Paul Scherrer Institu) , U. Staub (Swiss Light Source) , V. Scagnoli (European Synchrotron Radiation Facility,)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Letters , VOL 103 (9)

State: Published (Approved)
Published: August 2009

Abstract: 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.

Subject Areas: Physics

Facility: SIM at SLS

Added On: 05/10/2009 09:41

Discipline Tags:

Physics Materials Science

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