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Shubnikov-de Haas measurements of high quality URu2Si2 single crystals revealtwo previously unobserved Fermi surface branches in the so-called hidden orderphase. Therefore about 55% of the enhanced mass is now detected. Under pressurein the antiferromagnetic state, the Shubnikov-de Haas frequencies for magneticfields applied along the crystalline c axis show little change compared withthe zero pressure data. This implies a similar Fermi surface in both the hiddenorder and antiferromagnetic states, which strongly suggests that the latticedoubling in the antiferromagnetic phase due to the ordering vector QAF = (0 01) already occurs in the hidden order. These measurements provide a good testfor existing or future theories of the hidden order parameter.

Similarity of Fermi Surface in the Hidden Order State and in the Antiferromagnetic State of URu2Si2