  The growth and characterization of CePtIn4, stabilized by 10% Zn substitution
for In, is reported. The new material is orthorhombic, space group Cmcm (No.
63), with lattice parameters a = 4.51751(4) {\AA}, b = 16.7570(2) {\AA}, and c
= 7.36682(8) {\AA}, and the refined crystal composition has 10% of Zn
substituted for In, i.e. the crystals are CePt(In3.6Zn0.1)4. Crystals were
grown using a self-flux method: only growths containing Zn yielded CePtIn4
crystals, while Ce3Pt4In13 crystals formed when Zn was not present. Anisotropic
temperature-dependent magnetic susceptibilities for single crystals show that
Zn-stabilized CePtIn4 orders magnetically at ~1.9 K. High-temperature
Curie-Weiss fits indicate an effective moment of ~2.30 muB/ Ce and a
directionally averaged Weiss-temperature of approximately - 9 K. Specific heat
data shows a peak consistent with the ordering temperature seen in the magnetic
susceptibility data. Zn-stabilized CePtIn4 is metallic and displays no
superconducting transition down to 0.14 K.
