Magnetic correlations in YBaCo4O7 probed by single-crystal neutron scattering

Abstract

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".

References in corpus (4)

• Spin chirality on a two-dimensional frustrated lattice
• Competing magnetic interactions in the extended Kagome system YBaCo4O7
• Approaching the ground state of the kagome antiferromagnet
• Magnetic Structure of YBaCo4O7 with Kagome- and Triangular-Lattices

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