Physics – Condensed Matter – Materials Science
Scientific paper
2009-04-23
Phys. Rev. Lett. 103, 037202 (2009)
Physics
Condensed Matter
Materials Science
Scientific paper
10.1103/PhysRevLett.103.037202
We have studied the frustrated system YBaCo4O7 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 reveals 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 degrees configuration- decays rapidly as typically found in spin-liquids. YBaCo4O7 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 act as an external "field".
Chapon Laurent C.
Manuel Pascal
Mitchell John F.
Radaelli Paolo G.
Zheng Han-qing
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