Abstract
We present Shubnikov-de Haas measurements performed on two samples of URu 2Si 2 (I‖c and I‖a) in magnetic fields up to 24 T and at temperatures down to 60 mK. Four different energy bands could be determined between the [0 0 1]-[1 0 0] and the [1 0 0]-[1 1 0] directions of the tetragonal structure. Their corresponding cyclotron masses range between 5.8m e and 13.0m e . The measured Fermi surface is compared to available band structure calculations. Surprisingly, for magnetic fields oriented in the tetragonal plane, a nonlinear splitting of the 1.2 kT frequency could be discerned in the field range between 17 and 21 T.
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