Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-07-10
Phys. Rev. Lett. 98, 067201 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures, contact author: w.schweika@fz-juelich.de
Scientific paper
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.
Lemmens Peter
Schweika Werner
Valldor Martin
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