Approaching the ground state of the kagome antiferromagnet

Abstract

Y{0.5}$Ca{0.5}BaCo4O7 contains kagome layers of Co ions, whose spins are strongly coupled according to a Curie-Weiss temperature of -2200 K. At low temperatures, T = 1.2 K, our diffuse neutron scattering study with polarization analysis reveals characteristic spin correlations close to a predicted two-dimensional coplanar ground state with staggered chirality. The absence of three dimensional long-range AF order proves negligible coupling between the kagome layers. The scattering intensities are consistent with high spin S=3/2 states of Co2+ in the kagome layers and low spin S=0 states for Co3+ ions at interlayer sites. Our observations agree with previous Monte Carlo simulations indicating a ground state of only short range chiral order.

4 pages, 4 figures, contact author: [email protected]

References in corpus (4)

• Spin chirality on a two-dimensional frustrated lattice
• Spin waves in the Frustrated Kagome Lattice Antiferromagnet KFe3(OH)6(SO4)2
• Competing magnetic interactions in the extended Kagome system YBaCo4O7
• Remnant magnetization above room temperature in semiconducting Y_0.5Ca_0.5BaCo_4O_7

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