학술논문
Dynamics of the two-dimensional S=½ dimer system (C5 H6 N2 F)2 CuCl4 .
Document Type
Article
Author
Source
Subject
*NEUTRONS
*SCATTERING (Physics)
*HEISENBERG uncertainty principle
*LATTICE dynamics
*BAND gaps
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Language
ISSN
1098-0121
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. [ABSTRACT FROM AUTHOR]