Solution growth of Ce-Pd-In single crystals: Characterization of the heavy-fermion superconductor Ce2PdIn8

Solution growth of single crystals of the recently reported new compound Ce2PdIn8 was investigated When growing nom a stoichiometry in a range 2:1.20-2 1:35, single crystals of CeIn3 covered by a thin (similar to 50 mu m) single-crystalline layer of Ce2PdIn8 were mostly obtained Using palladium richer compositions the thickness of the Ce2PdIn8 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 Ce4Pd10In21 and traces of phases with the stoichiometry CePd2In7, Ce15Pd18In7 (determined only by EDX) have been identified. Magnetic measurements of the Ce2PdIn8 single crystals reveal paramagnetic behaviour of the Ce3+ 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. (C) 2010 Elsevier Ltd All rights reserved.