Superconductivity on the border of a spin-gapped Mott insulator: NMR studies of the quasi-two-dimensional organic system EtMe3P[Pd(dmit)2]2

T. Itou; A. Oyamada; S. Maegawa; K. Kubo; H. M. Yamamoto; R. Kato

doi:10.1103/PhysRevB.79.174517

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Superconductivity on the border of a spin-gapped Mott insulator: NMR studies of the quasi-two-dimensional organic system EtMe3P[Pd(dmit)2]2

T. Itou, A. Oyamada, S. Maegawa, K. Kubo, H. M. Yamamoto, R. Kato

DOI 10.1103/PhysRevB.79.174517 · Physical Review B

T1

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Abstract

We present C13-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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
EtMe3P[Pd(dmit)2]2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	0.43 GPa	onset
EtMe3P[Pd(dmit)2]2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	0.6 GPa	onset