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The antiferromagnetic (AFM) state has been investigated in the threeheavy-fermion compounds URu2Si2, UPd2Al3, and UNi2Al3 by measuring dV/dI(V)curves of point contacts at different temperatures (1.5-20 K) and magneticfields (0-28 T). The zero-bias maximum in dV/dI(V) for URu2Si2 points to apartially gapped Fermi-surface related to the itinerant nature of the AFM statecontrary to UPd2Al3 where analogous features have not been found. The AFM statein UNi2Al3 has more similarities with URu2Si2. For URu2Si2, the same criticalfield of about 40 T along the easy c axis is found for all features in dV/dI(V)corresponding to the Neel temperature, the gap in the electronic density ofstates, and presumably the ordered moments.Comment: 10 pages incl. 5 figures, LaTex 2

Magnetic state in URu2Si2, UPd2Al3, and UNi2Al3 probed by point contacts