Pressure-induced superconductivity and Mott transition in spin-liquid κ(ET)2Cu2(CN)3 probed by C13 NMR

Y. Shimizu, H. Kasahara, T. Furuta, K. Miyagawa, K. Kanoda, M. Maesato, and G. Saito
Phys. Rev. B 81, 224508 – Published 9 June 2010

Abstract

Pressure-induced superconductivity and Mott transition in the spin-liquid Mott insulator κ(ET)2Cu2(CN)3 have been investigated by C13 NMR measurements. The Mott transition from the spin liquid to the Fermi liquid is observed as a sudden decrease in 1/T1T, where T1 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/T1 have a cubic temperature dependence with no Hebel-Slichter peak, which is consistent with non-s-wave superconducting pairing.

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  • Received 29 November 2009

DOI:https://doi.org/10.1103/PhysRevB.81.224508

©2010 American Physical Society

Authors & Affiliations

Y. Shimizu1,2,*, H. Kasahara1, T. Furuta1, K. Miyagawa1, K. Kanoda1, M. Maesato2, and G. Saito2,†

  • 1Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
  • 2Division of Chemistry, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan

  • *Present address: Institute for Advanced Research, Nagoya University, Japan.
  • Present address: Meijo University, Nagoya, Japan.

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Vol. 81, Iss. 22 — 1 June 2010

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