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26 April 2024 |
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Magnetic Excitations of the Spin Gap System TlCuCl$_3$ | | A. Oosawa
; T. Kato
; H. Tanaka
; K. Kakurai
; M. Mueller
; H. -J. Mikeska
; | | Date: |
8 Aug 2001 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | TlCuCl$_3$ has a singlet ground state with the excitation gap $Delta =0.65$ meV. The magnetic excitations in TlCuCl$_3$ 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 KCuCl$_3$. 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 TlCuCl$_3$ is a strongly coupled spin-dimer system. | | Source: | arXiv, cond-mat/0108130 | | Services: | Forum | Review | PDF | Favorites | |
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