LuNi2B2C: A novel Ni-based strong-coupling superconductor
Warren E. Pickett, David J. Singh
DOI 10.1103/PhysRevLett.72.3702 · Physical Review Letters
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Abstract
The surprising recent discovery of superconductivity up to Tc=23 K in Ni- and Pd-based rare-earth borocarbides raises the question of whether or not these materials constitute a new class of high temperature superconductors. For LuNi2B2C, with Tc=16.6 K and a (known) layered crystal structure I4/mmm, electronic structure calculations indicate that it is a strongly 3D metal with all atoms contributing to the metallic character, completely unlike the cuprate HTS. Incorporating resistivity data we deduce a very strong electron-phonon coupling λtr=2.6, which we relate to an unusual combination of states at the Fermi level and substantial contributions from the vibrations of the light atoms.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16.6 | Pressure not reported | unknown |
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