Abstract
The tetragonal (1-2-2) intermetallic compound URu2Si2 represents the only heavy-electron material [γ(T > 18 K) ≈ 180 mJ/mol · K2] in which both antiferromagnetic (TN ≃ 17.5 K) and superconducting (Tc ≃ 1.2 K) transitions occur. At low temperatures (T < Tc) there is a coexistence of these two ordered states. The purpose of this paper is to present the basic experimental features of URu2Si2 including the results of specific-heat, magnetization, susceptibility, critical-field, high-field magnetization, (magneto-) resistivity, pressure dependence, thermal expansion, neutron-scattering, NMR, Hall-effect, electron spectroscopy, and μSR. These properties suggest that the antiferromagnetic transition, i.e., the alternate plane order of unusually small 0.03μB/U moments along the c-axis, opens up an energy gap on some portions of the Fermi surface. The remaining nongapped electrons are able at a lower temperature to become superconducting. Hence it would seem that both the magnetism and the superconductivity are carried by the same hybridized 5f-U electrons.
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