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27 April 2024 |
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Magnetic Excitations in the Spin Gap System TlCuCl$_3$ | | A. Oosawa
; T. Kato
; H. Tanaka
; H. Uekusa
; Y. Ohashi
; K. Nakajima
; M. Nishi
; K. Kakurai
; | | Date: |
7 Apr 2000 | | Subject: | cond-mat | | Abstract: | Single-crystal neutron inelastic scattering was performed in order to investigate the magnetic excitations in the spin gap system TlCuCl$_3$. The constant-${f Q}$ energy scan profiles were collected in the $a^*-c^*$ plane. Three excitations are observed for $E{leq}15$ meV. One of the excitations is identified to be magnetic excitation. The lowest magnetic excitation with $Esim 0.5$ meV occurs at ${f Q}=(1, 0, 1)$, as observed in KCuCl$_3$. 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. | | Source: | arXiv, cond-mat/0004108 | | Services: | Forum | Review | PDF | Favorites | |
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