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The bulk properties of the LaSn3"In3(i ) and similar alloy systems display a dramatic, somewhat oscillatory, dependence on the valence-electron concentration. For the LaSn, "In, (, . "& alloy system we have studied the dependence on x of the magnetic susceptibility g and the local electronic behavior at the La and Sn-In sites using the La" and Sn'" nuclear-magnetic-resonance Knight shifts E and spin-lattice relaxation times T,. These results are compared with those for the superconducting transition temperature 1"the electronic-specific-heat coefficient y, and the Debye temperature 8D. Using McMillan's strong-coupling model we have calculated from y and 1,/8D, the electron-phonon coupling parameter X, the bare density of states N(0), and the electron-phonon interaction strength V. For the NMR measurements, the Sn NMR properties follow the behavior of the bulk density of states at the Fermi energy, N(0), considerably better than do the La NMR properties suggesting that the local electronic properties of the Sn-In sites play the dominant role in determining T, . Analysis of the La NMR and y behavior with x indicates the paramagnetic susceptibility of these alloys arises from the La d band with the La d-orbital contribution accounting for most of the large susceptibility for x near LaSn, and LaIn3.

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