K. Matan, Y. Nambu, Y. Zhao, T. J. Sato, Y. Fukumoto, T. Ono, H. Tanaka, C. Broholm, A. Podlesnyak, G. Ehlers
Magnetic excitations of the pinwheel valence bond solid state in the distorted kagome lattice antiferromagnet Rb2Cu3SnF12 were studied using high-resolution inelastic neutron scattering. A weakly dispersive mode around 5 meV and duplicate triplet excitations were observed. These modes cannot be reproduced by the dimer series expansion of six dimers, but are attributed to the folding of the two dimensional Brillouin zone caused by the structural transition. Polarization analysis of the excitations indicates that the transitions from the singlet state to the S_tot,z=+-1 and S_tot,z=0 triplet states are predominantly in-plane and out-of-plane polarized, respectively. Furthermore, continuum scattering was observed above 8 meV.
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http://arxiv.org/abs/1305.4042
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