Journal
PHYSICAL REVIEW B
Volume 81, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.224508
Keywords
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Funding
- MEXT [17071003, 20110002]
- JSPS [20244055, 20540346]
- Global Center of Excellence for the Physical Sciences Frontier [G04]
- Grants-in-Aid for Scientific Research [20110001, 20110002, 20540346, 22655045, 20244055, 22740226] Funding Source: KAKEN
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Pressure-induced superconductivity and Mott transition in the spin-liquid Mott insulator kappa-(ET)(2)Cu-2(CN)(3) have been investigated by C-13 NMR measurements. The Mott transition from the spin liquid to the Fermi liquid is observed as a sudden decrease in 1/T1T, where T-1 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, 1/T-1 have a cubic temperature dependence with no Hebel-Slichter peak, which is consistent with non-s-wave superconducting pairing.
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