Direct Transition Between a Singlet Mott Insulator and a Superconductor

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.

4 pages, 3 figure, Changes to the figures. Accepted for publication on Physical Review Letters

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