Microscopic modulation of local density of states in superconducting α−(BEDT-TTF)2NH4Hg(SCN)4 studied by site-selective C13-NMR spectroscopy
Y. Ihara, K. Noda, A. Kawamoto
DOI 10.1103/PhysRevB.90.041107 · Physical Review B
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Abstract
The local electronic state at every crystallographically independent molecular site was separately investigated in the organic superconductor α−(BEDT-TTF)2NH4Hg(SCN)4 using site-selective C13-NMR spectroscopy. The density of states (DOS) at three molecular sites shows independent temperature variation, which is caused by the long-range Coulomb interaction. Comparing the present results with those for a nonsuperconducting counterpart α−(BEDT-TTF)2RbHg(SCN)4, we found that the uniform DOS at two of three independent molecular sites is crucial to induce superconductivity. Taking the site-dependent DOS as a parameter, we constructed a phase diagram for a superconductor with long-range Coulomb interaction, an α-type BEDT-TTF family, and summarized the competition between charge instability and superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (BEDT-TTF)2NH4Hg(SCN)4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure unresolved | unknown |
| (BEDT-TTF)2NH4Hg(SCN)4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | unknown |
| (BEDT-TTF)2I3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | unknown |
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