Abstract
Pressure-induced superconductivity and Mott transition in the spin-liquid Mott insulator have been investigated by NMR measurements. The Mott transition from the spin liquid to the Fermi liquid is observed as a sudden decrease in , where is the nuclear-spin-lattice relaxation time. Pseudogap behavior is absent in the Fermi-liquid state, unlike in the metallic phase adjacent to the antiferromagnetic Mott insulator. In the superconducting state, have a cubic temperature dependence with no Hebel-Slichter peak, which is consistent with non--wave superconducting pairing.
- Received 29 November 2009
DOI:https://doi.org/10.1103/PhysRevB.81.224508
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