Solution growth of single crystals of the recently reported new compound Ce 2 PdIn 8 was investigated. When growing from a stoichiometry in a range 2:1:20 -2:1:35, single crystals of CeIn 3 covered by a thin (~50 μm) single-crystalline layer of Ce 2 PdIn 8 were mostly obtained. Using palladium richer compositions the thickness of the Ce 2 PdIn 8 layers were increased, which allowed mechanical extraction of single-phase slabs of the desired compound suitable for a thorough study of magnetism and superconductivity. In some solution growth products also CePd 3 In 6 (LaNi 3 In 6 -type of structure) and traces of phases with the stoichiometry CePd 2 In 7 , Ce 1.5 Pd 1.5 In 7 (determined only by EDX) have been identified. Magnetic measurements of the Ce 2 PdIn 8 single crystals reveal paramagnetic behaviour of the Ce 3+ ions with significant magnetocrystalline anisotropy. Above 70 K the magnetic susceptibility follows the Curie-Weiss law with considerably different values of the paramagnetic Curie temperature, for the magnetic field applied along the a-(-90 K) and c-(-50 K) axis. Below the reported critical temperature for superconductivity T c (0.69 K) the electrical resistivity drops to zero. Comparative measurements of the electrical resistivity, heat capacity and AC susceptibility of several crystals reveal that the superconducting transition is strongly sample-dependent.
IntroductionIn some Ce-based compounds, the interaction of the Ce ions with the conduction electrons often leads to a large enhancement of the effective electron mass. These socalled heavy-fermion (HF) compounds exhibit attractive electronic properties, such as strongly enhanced paramagnetism, non-Fermi liquid behaviour, interplay between magnetism and superconductivity (SC), etc. During the last decade, the attention of many researchers has been focused on the series of HF materials of the general chemical formula Ce m T n In 3m+2n where m, n = 1 or 2 and T = Co, Rh, Ir. These compounds crystallize in the Ho m Co n Ga 3m+2n -type tetragonal structures with the space group P4/mmm. These structures are built by n layers of distorted cuboctahedra [CeIn 3 ] and one monolayer of rectangular parallelepipeds [TIn 2 ] stacked sequentially in the [001] direction [1] making the structure to be quasi-2D. The main building block of these compounds, the cubic CeIn 3 , is a heavy-fermion antiferromagnet (AF) with a Néel temperature T N = 10.2 K [2] and becomes superconducting (SC) under pressure [3]. The whole Ce m T n In 3m+2n series is characterized by interplay between magnetism and unconventional superconductivity, which makes these compounds suitable for thorough studies of varieties of the two cooperative phenomena in strongly correlated electron systems. The quasi-2D R m T n In 3m+2n crystal structure provides investigation of the effect of varying dimensionality on magnetism and unconventional superconductivity because