Magnetic correlations in the extended Kagome YBaCo{sub 4}O{sub 7} probed by single-crystal neutron scattering.
We have studied the frustrated system YBaCo{sub 4}O{sub 7.0} generally described as an alternating stacking of kagome and triangular layers of magnetic ions on a trigonal lattice, by single-crystal neutron diffraction experiments above the Neel ordering transition. Experimental data reveal pronounced magnetic diffuse scattering, which is successfully modeled by direct Monte Carlo simulations. Long-range magnetic correlations are found along the c axis, due to the presence of corner-sharing bipyramids, creating quasi-one-dimensional order at finite temperature. In contrast, in the kagome layers (ab plane), the spin-spin correlation function, displaying a short-range 120{sup o} configuration, decays rapidly as typically found in spin liquids. YBaCo{sub 4}O{sub 7} experimentally realizes a new class of two-dimensional frustrated systems where the strong out-of-plane coupling does not lift the in-plane degeneracy, but instead acts as an external 'field'.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 961726
- Report Number(s):
- ANL/MSD/JA-64326; PRLTAO; TRN: US0904305
- Journal Information:
- Phys. Rev. Lett., Vol. 103, Issue 2009; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- ENGLISH
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