Abstract
In the so-called 115 family members with chemical formulae of Ce T In 5 ( T = Co, Rh, Ir) and A n T Ga 5 ( A n = U, Np, Pu), our analysis of the Knight shift and spin–lattice relaxation rates suggests that larger XY-type anisotropy in the antiferromagnetic spin fluctuations in the normal states would favor d -wave superconductivity with higher T c . In order to examine this working hypothesis, the anisotropy ratios of antiferromagnetic fluctuations are derived from our NMR results for the superconductor NpPd 5 Al 2 and antiferromagnet CePd 5 Al 2 , which are tetragonal compounds with a 115-related structure. CePd 5 Al 2 shows Ising-type anisotropy, which is the same anisotropy as in the ordered state. On the other hand, NpPd 5 Al 2 shows XY-type anisotropy just above T c .
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