Abstracts 2004

Abstract of Publication No. 481

Ch. Rüegg, N. Cavadini, A. Furrer, K. Krämer, H.-U. Güdel, P. Vorderwisch, K. Habicht, H. Mutka and A. Wildes
Spin dynamics in the BEC phase of the S=1/2 quantum spin system TlCuCl3
J. Magn. Magn. Mater. 272-276, 195-196 (2004)      Full Text (PDF)      DOI-Link     

Abstract: The copper salt S=1/2 TlCuCl3 is a three-dimensional quantum spin system with a singlet ground-state of dimer origin. A spin energy gap D0.7 meV separates the ground-state from the triplet waves, which propagate along all directions in reciprocal space. Across the quantum critical point at Hc=D/gmB Bose–Einstein condensation of the triplet quasi-particles has been observed. The inelastic neutron scattering spectra at H>Hc proof the coexistence of a gapless Goldstone mode, which has a linear dispersion, with renormalized quadratic Zeeman modes.

Last modified: 13.12.11 by Gabriela Frei