Direct Transition between a Singlet Mott Insulator and a Superconductor
Massimo Capone, Michele Fabrizio, Erio Tosatti
DOI 10.1103/PhysRevLett.86.5361 · Physical Review Letters
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Abstract
We argue that a normal Fermi liquid and a singlet, spin-gapped Mott insulator cannot be continuously connected, and that some intermediate phase must intrude between them. By explicitly working out a case study where the singlet insulator is stabilized by orbital degeneracy and an inverted Hund’s rule coupling, mimicking a Jahn-Teller effect, we find that the intermediate phase is a superconductor.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Rb4C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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