Quantum statistics of interacting dimer spin systems.
The compound TlCuCl(3) represents a model system of dimerized quantum spins with strong interdimer interactions. We investigate the triplet dispersion as a function of temperature by inelastic neutron scattering experiments on single crystals. By comparison with a number of theoretical approaches we demonstrate that the description of Troyer, Tsunetsugu, and Würtz [Phys. Rev. B 50, 13 515 (1994)10.1103/Phys. Rev. B 50, 13515] provides an appropriate quantum statistical model for dimer spin systems at finite temperatures, where many-body correlations become particularly important.
London Centre for Nanotechnology, Department of Physics and Astronomy, University College London, UK. c.ruegg@ucl.ac.uk
Ch
Ch
Rüegg
B
B
Normand
M
M
Matsumoto
Ch
Ch
Niedermayer
A
A
Furrer
K W
KW
Krämer
H-U
HU
Güdel
Ph
P
Bourges
Y
Y
Sidis
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H
Mutka