Spin dynamics, short range order and spin freezing in Y0.5Ca0.5BaCo4O7
Journal Article
·
· Physical Review B
- ISIS Facility, Rutherford Appleton Laboratory
- ORNL
- Institut Laue-Langevin (ILL)
- Institut des Materiaux Jean Rouxel (IMN), Universite de Nantes-CNRS
- University of Geneva
Y0.5Ca0.5BaCo4O7 was recently introduced as a possible candidate for capturing some of the predicted classical spin kagome ground-state features. Stimulated by this conjecture, we have taken up a more complete study of the spin correlations in this compound with neutron scattering methods on a powder sample characterized with high-resolution neutron diffraction and the temperature dependence of magnetic susceptibility and specific heat. We have found that the frustrated near-neighbor magnetic correlations involve not only the kagome planes but concern the full Co sublattice, as evidenced by the analysis of the wave-vector dependence of the short-range order. We conclude from our results that the magnetic moments are located on the Co sublattice as a whole and that correlations extend beyond the two-dimensional kagome planes. We identify intriguing dynamical properties, observing high-frequency fluctuations with a Lorentzian linewidth G?20 meV at ambient temperature. On cooling a low-frequency ({approx}1 meV) dynamical component develops alongside the high-frequency fluctuations, which eventually becomes static at temperatures below T {approx} 50 K. The high-frequency response with an overall linewidth of {approx}10 meV prevails at T?2 K, coincident with a fully elastic short-range-ordered contribution.
- Research Organization:
- Oak Ridge National Laboratory (ORNL); Spallation Neutron Source
- Sponsoring Organization:
- SC USDOE - Office of Science (SC)
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1003744
- Journal Information:
- Physical Review B, Journal Name: Physical Review B Journal Issue: 2 Vol. 83; ISSN 1098-0121; ISSN 1550-235X
- Country of Publication:
- United States
- Language:
- English
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