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We report specific heat measurements on a high quality single crystal of theheavy-fermion compound CePt$_2$In$_7$ in magnetic fields up to 27 T. Thezero-field specific heat data above the N\'{e}el temperature, $T_N$, suggest amoderately enhanced value of the electronic specific heat coefficient $\gamma =180 \; \rm{mJ/K^2mol}$. For $T<T_N$, the data at zero applied magnetic fieldare consistent with the existence of an anisotropic spin-density wave opening agap on almost entire Fermi surface, suggesting extreme two-dimensionalelectronic and magnetic structures for CePt$_2$In$_7$. $T_N$ is monotonicallysuppressed by magnetic field applied along the $c$-axis. When field is appliedparallel to the $a$-axis, $T_N$ first increases at low field up to about 10 Tand then decreases monotonically at higher field. Magnetic phase diagram basedon specific heat measurements suggests that a field-induced quantum criticalpoint is likely to occur slightly below 60 T for both principal orientations ofthe magnetic field.

Specific heat in high magnetic fields and magnetic phase diagram of CePt$_2$In$_7$