Charge ordering and pressure-induced superconductivity in β″−(DODHT)2PF6

H. Nishikawa; Y. Sato; K. Kikuchi; T. Kodama; I. Ikemoto; J. Yamada; H. Oshio; R. Kondo; S. Kagoshima

doi:10.1103/PhysRevB.72.052510

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Charge ordering and pressure-induced superconductivity in β″−(DODHT)2PF6

H. Nishikawa, Y. Sato, K. Kikuchi, T. Kodama, I. Ikemoto, J. Yamada, H. Oshio, R. Kondo, S. Kagoshima

DOI 10.1103/PhysRevB.72.052510 · Physical Review B

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Abstract

Transport measurements of a pressure-induced organic superconductor, β″−(DODHT)2PF6 [DODHT=(1,4−dioxane−2,3−diyldithio)dihydrotetrathiafulvalene], were performed under various pressures to obtain a pressure-temperature phase diagram. The pressure application of 13.2kbar induced superconductivity at 2.3K. Due to a fractional existence of superconductivity, a resistive state was observed with decreasing temperature in a narrow pressure range above 13.2kbar. X-ray and magnetic measurements at ambient pressure revealed that the insulating state has a charge disproportionation, or a charge ordering (CO) state, with stripes along the molecular side-by-side direction. These results suggest that the charge fluctuation may play a crucial role in the superconductivity in β″−(DODHT)2PF6.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
(DODHT)2PF6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.3	1.32 GPa	onset
(DODHT)2PF6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.7	1.32 GPa	onset
α-(ET)2I3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
(ET)3Cl2•2H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
(ET)2SF5CH2CF2SO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown