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Dynamics of the two-dimensional S=1/2 dimer system (C5H6N2F)2CuCl4

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arxiv 1010.1230 v2 pith:ZL4VEA5E submitted 2010-10-06 cond-mat.str-el

Dynamics of the two-dimensional S=1/2 dimer system (C5H6N2F)2CuCl4

Tao Hong , S. N. Gvasaliya , S. Herringer , M. M. Turnbull , C. P. Landee , L.-P. Regnault , M. Boehm , A. Zheludev This is my paper
classification cond-mat.str-el
keywords two-dimensionalamino-5-fluoropyridiniumantiferromagneticapproximationc5h6n2fcomparingconsistentconstants
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Inelastic neutron scattering was used to study a quantum S=1/2 antiferromagnetic Heisenberg system-Bis(2-amino-5-fluoropyridinium) Tetrachlorocuprate(II). The magnetic excitation spectrum was shown to be dominated by long-lived excitations with an energy gap as 1.07(3) meV. The measured dispersion relation is consistent with a simple two-dimensional square lattice of weakly-coupled spin dimers. Comparing the data to a random phase approximation treatment of this model gives the intra-dimer and inter-dimer exchange constants J=1.45(2) meV and J'=0.31(3) meV, respectively.

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