Abstracts 2000

Abstract of Publication No. 348

N. Cavadini, W. Henggeler, A. Furrer, H.-U. Güdel, K. Krämer and H. Mutka
Magnetic excitations and spin gap in KCuCl3
Physica B 540, 276-278 (2000)      Full Text (PDF)      DOI-Link     

Abstract: Detailed knowledge of the dynamical spin-spin correlation function S(k, w) turns out to be a necessity in characterizing unconventional quantum spin systems - in particular if a finite spin excitation gap separates a singlet ground state from excited states. Basic predictions relying on a Heisenberg dimer model are presented in the context of neutron scattering investigations on the S = 1/2 Cu2+ compound KCuCl3. Expressions concerning dispersion relation, intensity and field dependence of the observed singlet-triplet modes above the gap are derived and compared to the experimental results. The agreement between theory and experiment is found to be remarkably good, supporting the characterization of KCuCl3 as a quantum spin liquid near to the dimer limit.

Last modified: 13.12.11 by Gabriela Frei