Express Letter
Cobalt-Dimer Nitrides: A Potential Novel Family of High-Temperature Superconductors
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Abstract
We predict that the square lattice layer formed by [CoN] diamond-like units can host high-temperature superconductivity. The layer appears in the stable ternary cobalt nitride, BaCoN. The electronic physics of the material stems from CoN layers where the dimerized Co pairs form a square lattice. The low energy physics near Fermi energy can be described by an effective two-orbital model. Without considering interlayer couplings, the two orbitals are effectively decoupled. This electronic structure satisfies the “gene” character proposed for unconventional high-temperature superconductors. We predict that the leading superconducting pairing instability is driven from an extended -wave () to a -wave by hole doping, e.g., in BaKCoN. This study provides a new platform to establish the superconducting mechanism of unconventional high-temperature superconductivity. -
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References
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