Abstract
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 is shown to be dominated by long-lived excitations with an energy gap of Δ=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 intradimer and interdimer exchange constants J=1.45(2) meV and J′=0.31(3) meV, respectively.
Original language | English |
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Article number | 052401 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 83 |
Issue number | 5 |
DOIs | |
State | Published - Feb 4 2011 |