Dynamics of the two-dimensional S=12 dimer system (C5H 6N2F)2CuCl4

Tao Hong, S. N. Gvasaliya, S. Herringer, M. M. Turnbull, C. P. Landee, L. P. Regnault, M. Boehm, A. Zheludev

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10 Scopus citations

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 languageEnglish
Article number052401
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number5
DOIs
StatePublished - Feb 4 2011

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