Abstract
The low-temperature specific heats of ${\mathrm{La}}_{3}$In and ${\mathrm{La}}_{3}$Tl were measured in the superconducting and the normal state, the latter being stabilized in a magnetic field of 90 kOe. From these data, the thermodynamic critical fields and other thermodynamic properties could be determined. High and strongly varying electronic densities of states near the Fermi level are derived from magnetic-susceptibility measurements and confirmed by strongly temperature-dependent Knight shifts on the ${\mathrm{In}}^{115}$ nuclei in ${\mathrm{La}}_{3}$In and on the ${\mathrm{Tl}}^{203}$ and ${\mathrm{Tl}}^{205}$ nuclei in ${\mathrm{La}}_{3}$Tl. All remarkable properties of ${\mathrm{La}}_{3}$In and ${\mathrm{La}}_{3}$Tl, suggest that these compounds belong to the class of strong-coupling superconductors and are closely related to the behavior of fcc La under pressure.
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