Doping study of the heavy fermion superconductor CePt$_{2}$In$_{7}$*

The CeMIn$_{5}$ (M$=$Co, Rh, Ir) materials are prototypical heavy fermion superconductors close to antiferromagnetism, making them ideal candidates to investigate the interplay of unconventional superconductivity and magnetism and to explore quantum criticality. CeRhIn$_{5}$ displays all of the signatures of a material close to an antiferromagnetic quantum critical point (QCP): 1) the antiferromagnetism at T$_{N} =$ 3.8 K is suppressed under applied pressure at Pc$=$2.5 GPa, 2) non-Fermi liquid behavior in the electrical resistivity and specific heat is observed near Pc, and 3) a dome of unconventional superconductivity appears with Tc max$=$2.6 K. To investigate the nature of the quantum criticality in the Ce$_{m}$M$_{n}$In$_{3m+2n}$ family, we focus attention on the newest member, CePt$_{2}$In$_{7}$, with m$=$1 and n$=$2, where m and n are CeIn$_{3}$ and MIn$_{2}$ layers. Similar to its cousin CeRhIn$_{5}$ (m$=$1, n$=$1), it shows a dome of superconductivity and signatures of quantum criticality under pressure in the vicinity of where the Neel temperature is suppressed at Pc$=$3 GPa. As an alternative to the application of pressure to access the QCP, we present the magnetic, thermal and transport properties of doped CePt$_{2}$In$_{7}$.