Magnetic Excitations in the Spin Gap System TlCuCl₃
Oosawa, A. · Kato, T. · Tanaka, H. · Uekusa, H. · Ohashi, Y. · Nakajima, K. · Nishi, M. · Kakurai, K.
Original · EN
Single-crystal neutron inelastic scattering was performed in order to investigate the magnetic excitations in the spin gap system TlCuCl₃. The constant- Q energy scan profiles were collected in the a*-c* plane. Three excitations are observed for E≤15 meV. One of the excitations is identified to be magnetic excitation. The lowest magnetic excitation with E 0.5 meV occurs at Q=(1, 0, 1), as observed in KCuCl₃. The dispersion relation of the magnetic excitation can be fitted to the dispersion formula derived from the weakly coupled dimer model. The intradimer interaction is evaluated as J=5.23 meV, which coincides with the value estimated from the susceptibility data. However, one of the interdimer interactions obtained is so large that the weakly coupled dimer model is broken down.
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