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Phys. Rev. Lett. 96, 027201 (2006) [4 pages]

Nanomagnetic Droplets and Implications to Orbital Ordering in La1-xSrxCoO3

D. Phelan,1 Despina Louca,1 S. Rosenkranz,2 S.-H. Lee,1 Y. Qiu,3,4 P. J. Chupas,2 R. Osborn,2 H. Zheng,2 J. F. Mitchell,2 J. R. D. Copley,3 J. L. Sarrao,5 and Y. Moritomo6
1Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA
2Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
3NIST Center for Neutron Research, Gaithersburg, Maryland 20899, USA
4Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA
5Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
6Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
Received 23 May 2005; published 17 January 2006

Inelastic cold-neutron scattering on LaCoO3 provided evidence for a distinct low energy excitation at 0.6 meV coincident with the thermally induced magnetic transition. Coexisting strong ferromagnetic (FM) and weaker antiferromagnetic correlations that are dynamic follow the activation to the excited state, identified as the intermediate S=1 spin triplet. This is indicative of dynamical orbital ordering favoring the observed magnetic interactions. With hole doping as in La1-xSrxCoO3, the FM correlations between Co spins become static and isotropically distributed due to the formation of FM droplets. The correlation length and condensation temperature of these droplets increase rapidly with metallicity due to the double exchange mechanism.

©2006 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.96.027201
DOI: 10.1103/PhysRevLett.96.027201
PACS: 75.40.Gb; 61.12.-q; 71.30.+h; 71.70.-d
  • 75.40.Gb
    Dynamic properties of magnetic materials including dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc
  • 61.12.-q
    Neutron diffraction and scattering
  • 71.30.+h
    Metal–insulator transitions and other electronic transitions
  • 71.70.-d
    Level splitting and interactions (condensed matter)
  • YEAR: 2006
KEYWORDS: lanthanum compounds, strontium compounds, ferromagnetic materials, neutron diffraction, exchange interactions (electron), magnetic transitions, spin dynamics

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