Abstract
Single crystals of a new compound, Ce 2Rh 3(Pb,Bi) 5, have been grown via a flux-growth technique using molten Pb as a solvent. The compound has been characterized by single crystal X-ray diffraction and found to be of the orthorhombic Y 2Rh 3Sn 5 structure type [ Cmc2 1 (No. 36), Z=4] with lattice parameters a=4.5980(2), b=27.1000(17) and c=7.4310(4) Å, with V=925.95(9) Å 3. Ce 2Rh 3(Pb,Bi) 5 has a complex crystal structure containing Ce atoms encased in Rh– X ( X=Pb/Bi) pentagonal and octagonal channels in [100], with polyanions similar to those found in Ce 2Au 3In 5 and Yb 2Pt 3Sn 5. Magnetization measurements find that Ce 2Rh 3(Pb,Bi) 5 is a quasi-two-dimensional system, where the Ce moments are spatially well-localized. Heat capacity measurements show a transition at the Néel temperature of 1.5 K. Evidence for Fermi surface nesting is found in electrical resistivity measurements, and we argue that Ce 2Rh 3(Pb,Bi) 5 is very near a metal–insulator transition in zero field.
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