Missing valence states, diamagnetic insulators, and superconductors
C. M. Varma
DOI 10.1103/PhysRevLett.61.2713 · Physical Review Letters
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Abstract
About fifteen elements in the periodic table skip certain valences in all the compounds they form. This is understood to arise from a negative effective intra-atomic interaction. A model with such interactions as well as interatomic repulsions gives insulating behavior near half-filling and superconductivity farther from it, in agreement with the properties of BaPbxBi1−xO3 and BaxK1−xBiO3.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaPbxBi1-xO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | Pressure not reported | unknown |
| BaxK1-xBiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
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