  In order to elucidate the nature of the ground state in the heavy-electron
system PrInAg_2, we measured its specific heat for temperatures between 60 mK
and 2 K in magnetic fields up to 9 T. The peak maximum of the low temperature
anomaly in the specific heat (interpreted as Kondo anomaly) shifts from 0.42 K
at zero field to 0.45 K at 6 T, and to 0.5 K at 9 T. The data at 3 T (after
subtracting the low temperature tail due to a Schottky anomaly) is practically
indistinguishable from the zero field data. A low temperature nuclear Schottky
anomaly from a hyperfine enhancement of the Pr nuclei was observed in field.
Both enhanced hyperfine interaction and the insensitivity of the specific heat
anomaly to fields support the hypothesis that the Kondo effect in this system
has a non-magnetic origin.
