Resonating-valence-bond contribution to superconductivity in MgB2
G. Baskaran
DOI 10.1103/PhysRevB.65.212505 · Physical Review B
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Abstract
We view MgB2 as electronically equivalent to (nonstaggered) graphite (B− layer) that has undergone a zero-gap-semiconductor-to-superconductor phase transition by large c-axis (chemical) pressure due to Mg++ layers. Further, like the pπ-bonded planar organic molecules, graphite is a resonating-valence-bond (RVB) system. The RVB’s are the “preexisting Cooper pairs” in the “parental” zero-gap semiconducting B− (graphite) sheets that manifest themselves as a superconducting ground state of the transformed metal. Some consequences are pointed out.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | unknown |
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