Superconductivity competitive with checkerboard-type charge ordering in the organic conductor β−(meso-DMBEDT-TTF)2PF6
Naoki Morinaka, Kazuyuki Takahashi, Ryoma Chiba, Fumiko Yoshikane, Shoichi Niizeki, Masayuki Tanaka, Kyuya Yakushi, Masahito Koeda, Masato Hedo, Tetsuya Fujiwara, Yoshiya Uwatoko, Yutaka Nishio, Kohji Kajita, Hatsumi Mori
DOI 10.1103/PhysRevB.80.092508 · Physical Review B
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Abstract
The pressure dependence of resistivity for the checkerboard-type charge-ordered (CO) molecular conductor β−(meso-DMBEDT-TTF)2PF6 has been investigated. Under the low pressure of 0.6 kbar, the temperature of resistivity minimum (Tmin) falls from 90 K at an ambient pressure to 67 K, and after the resistivity has been increased, the superconducting (SC) transition is observed at 4.6 K. By applying magnetic field, the SC state is suppressed and the large positive magnetoresistance (MR) is demonstrated below Tmin in the CO state. Since the positive MR was observed even in the metallic state under high pressures, the summarized pressure-temperature (P−T) phase diagram reveals that the SC state neighbors to the CO-insulating and charge-fluctuated metallic states.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (meso-DMBEDT-TTF)2PF6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.6 | 0.06 GPa | onset |
| (meso-DMBEDT-TTF)2PF6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.6 | 0.52 GPa | onset |
| TMTSF2CF3SO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2 | Pressure not reported | unknown |
| (BEDT-TTF)2ICl2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14 | Pressure not reported | unknown |
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