Abstract
We have performed high-field/high-frequency ESR measurements on the spin gap system TlCuCl 3 in pulsed magnetic fields up to 55 T. The field dependence of the magnon excitation of TlCuCl 3 is studied above the field-induced quantum critical point at H g ≃ 6 T and up to fields corresponding to half of the magnetic saturation. The observed ESR modes are compared to recent theoretical calculations.
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