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

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

2010-10-06

arxiv.org/abs/1010.1230v2

Phys. Rev. B 83, 052401 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.83.052401

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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