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Abstract:
Using NMR techniques, we have investigated the superconducting and
magnetic properties of the heavy-fermion superconductors (HFS),
CeCu2Si2, and the recently discovered UM2Al3 (M = Ni and Pd). The NMR
studies have deduced that the nature of the magnetism in HFS is varied,
whereas the superconducting property possesses a rather common feature.
Namely, the nuclear spin-lattice relaxation rate 1/T1 is well described
in terms of an anisotropic energy gap model in which the gap vanishes on
lines at the Fermi surface with values of 2DELTA/k(B)T(c) = 5.0 and 5.5
for CeCu2Si2 and UPd2Al3, respectively. The unusual superconductivity
coexists with the magnetism, regardless of whether it is in a static or
a dynamical regime. In contrast, the NMR experiment detected no
signature of an anomaly at the superconducting transition temperature in
UNi2Al3. The interplay between magnetism and superconductivity is
discussed from a comparison with other heavy-fermion superconductors.
