A Single-Component Molecular Superconductor
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- 作者：HengBo Cui ; Hayao Kobayashi ; Shoji Ishibashi ; Masaaki Sasa ; Fumitatsu Iwase ; Reizo Kato ; Akiko Kobayashi
- 刊名：Journal of the American Chemical Society
- 出版年：2014
- 出版时间：May 28, 2014
- 年：2014
- 卷：136
- 期：21
- 页码：7619-7622
- 全文大小：301K
- 年卷期：v.136,no.21(May 28, 2014)
- ISSN：1520-5126
文摘
The pressure dependence of the resistivities of a single-component molecular conductor, [Ni(hfdt)2] (hfdt = bis(trifluoromethyl)tetrathiafulvalenedithiolate) with semiconducting properties at ambient pressure was examined. The four-probe resistivity measurements were performed up to 10 GPa using a diamond anvil cell. The low-temperature insulating phase was suppressed above 7.5 GPa and the resistivity dropped, indicating the superconducting transition occurred around 7.5鈥?.7 GPa with a maximum Tc (onset temperature) of 5.5 K. The high-pressure crystal and electronic band structures were derived by the first-principle calculations at 6鈥?1 GPa. The crystal was found to retain the semiconducting band structure up to 6 GPa. But the electron and hole Fermi surfaces appear at 8 GPa. These results of the calculations agree well with the observation that the pressure-induced superconducting phase of [Ni(hfdt)2] appeared just above the critical pressure where the low-temperature insulating phase was suppressed.