Abstract
The syntheses of La5Cu19P12and Ce5Cu19P12are reported, as is the crystal structure of La5Cu19P12, determined by single crystal X-ray diffraction. The compounds are found to be of the Sc5Co19P12structure type. Both new materials are metallic, with the resistivity of Ce5Cu19P12characteristic of heavy fermion behavior. The magnetic susceptibility of Ce5Cu19P12shows the signature of a crystal electric field (CEF) split 4fmultiplet for Ce, with a high temperature effective moment ofPeff= 1.71(2) μB/mole Ce. For La5Cu19P12, no local moment is observed for copper.
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