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NMR study of weak magnetism and superconductivity in heavy-fermion systems

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Kitaoka, Y., Kyogaku, M., Asayama, K., Nakamura, H., Geibel, C., Schank, C., et al. (1993). NMR study of weak magnetism and superconductivity in heavy-fermion systems. Physica B-Condensed Matter, 186-88, 229-235. doi:10.1016/0921-4526(93)90538-H.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-DCA8-B
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.