Abstract
We report the observation of superconductivity in intermetallic thorium-based boride carbides. For ThM 2B 2C, superconducting T c's of 6 K (M=Ni), 6.5 K (M=Pt), and 14.5 K (M=Pd) have been measured. These compounds are isostructural with the recently reported LnNi 2B 2C superconductors. We have also observed bulk superconductivity in an as-yet-undetermined thorium-palladium-boron-carbon quaternary phase at 21.5 K. Critical-field measurements on the two palladium-based superconductors, as well as the pressure dependence of T c for the 21.5 K superconductor, are reported.
Highlights
Very recently there has been a surge of activity in the study of superconductivity in intermetallic compounds containing boron and carbon [ 1,2 ]
We report superconductivity near 21.5 K in an as-yet-undetermined thorium-palladium-boron-carbon compound
This represents the highest Tc ever reported for a thorium-based intermetallic compound [6 ]
Summary
Very recently there has been a surge of activity in the study of superconductivity in intermetallic compounds containing boron and carbon [ 1,2 ]. Field-cooled measurements indicate a Meissner fraction of about 10% for each sample, comparable to what is observed for single-phase LnNiEBzC [ 3 ].
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