Journal
PHYSICAL REVIEW B
Volume 79, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.174517
Keywords
ground states; localised states; metal-insulator transition; nuclear magnetic resonance; organic superconductors; phase diagrams; strongly correlated electron systems
Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan [18740199, 19052005, 16GS0219]
- Grants-in-Aid for Scientific Research [18740199] Funding Source: KAKEN
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We present C-13-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.
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