We have measured the field-dependent heat capacity in the tetragonal anti ferromagnets CeRhIn5 and Ce2RhIn8, both of which have an enhanced value of the electronic specific heat coefficient gamma similar to 400 mJ/mol Ce K-2 above T-N. For Tc, both compounds behave in a manner expected for heavy-fermion systems as both T-N and the electronic heat capacity decrease as field is applied. When the field is applied in the tetragonal basal plane (B parallel toa), CeRhIn5 and Ce2RhIn8 have very similar phase diagrams which contain both first- and second-order field-induced magnetic transitions.
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