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Phys. Rev. B 79, 174517 (2009) [6 pages]Superconductivity on the border of a spin-gapped Mott insulator: NMR studies of the quasi-two-dimensional organic system EtMe3P[Pd(dmit)2]2 Received 3 November 2008; revised 16 March 2009; published 11 May 2009 We present 13C-NMR studies of the pressure-temperature phase diagram of the quasi-two-dimensional organic system EtMe3P[Pd(dmit)2]2, which has a spin-gapped Mott insulating ground state at ambient pressure. As the system is pressurized, the spin-gapped insulating ground state survives until the insulator-metal Mott transition, just beyond which a superconducting state appears. This demonstrates that the superconducting phase borders the spin-gapped insulating phase. The phase diagram contrasts with those of the large majority of other correlated-electron superconductors in which the superconducting phase borders a magnetically ordered phase. This implies the possibility that the present superconductivity has an exotic origin and nature. ©2009 The American Physical Society
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