2001/08/08 by A. Oosawa, Oosawa, A., T. Kato +9 · 1 citation
Chemistry · Physics and Astronomy · #Advanced Condensed Matter Physics #Inorganic Fluorides and Related Compounds #Physics of Superconductivity and Magnetism #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.cond-mat/0108130
20 pages, 6 figures, 12 eps files, revtex style
arxiv created 2002/01/28 · arxiv updated 2009/11/30
TlCuCl3 has a singlet ground state with the excitation gap Δ=0.65 meV. The magnetic excitations in TlCuCl3 have been investigated by means of neutron inelastic scattering experiments. The constant-\it\pmb Q energy scan profiles were collected in the a^*-c^* plane. A well-defined single magnetic excitation mode was observed. The dispersion relations along four different directions were determined. The lowest excitation occurs at \it\pmb Q=(h, 0, l) with integer h and odd l, as observed in KCuCl3. A cluster series expansion up to the sixth order was applied to analyze the dispersion relations, and the individual exchange interactions were evaluated. It was demonstrated that TlCuCl3 is a strongly coupled spin-dimer system.