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

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

2001-01-05

arxiv.org/abs/cond-mat/0101062v1

Fiz. Nizk. Temp. (Low Temp. Phys.) 2001, V27, N6, p. 668-673

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages incl. 5 figures, LaTex 2e

Scientific paper

10.1063/1.1382993

The antiferromagnetic (AFM) state has been investigated in the three heavy-fermion compounds URu2Si2, UPd2Al3, and UNi2Al3 by measuring dV/dI(V) curves of point contacts at different temperatures (1.5-20 K) and magnetic fields (0-28 T). The zero-bias maximum in dV/dI(V) for URu2Si2 points to a partially gapped Fermi-surface related to the itinerant nature of the AFM state contrary to UPd2Al3 where analogous features have not been found. The AFM state in UNi2Al3 has more similarities with URu2Si2. For URu2Si2, the same critical field 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 of states, and presumably the ordered moments.

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