Pressure-Induced Metallization and Superconductivity for Single Organic Crystal

单有机晶体的压力诱导金属化和超导性

• 批准号: 11640349
• 负责人: SHIMIZU Katsuya
• 金额: $ 2.24万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11640349/
• 关键词: Organic Molecule; Insulator-Metal Transition; Superconductivity; Resistance Measurement

Among the similar organic compounds, iodanil shows the best conductivity with in the measured pressures of 30 GPa without showing any tendency of up turn of resistivity at the highest-pressure region. The metallization of these simple organic crystals is of interest in the comparison with other conductors based on radical cation or anion salts.In the case of iodanil resistance drop attributed to superconducting transition was reported at pressure of 52 GPa and temperature of around 2 K.Iodanil is the first monomer crystal that becomes superconducting. In order to study the mechanism of metallization and super-conductivity of organic monomer crystal including iodanil, we measured electrical resistance of hexaiodobenzene under pressures at wide temperature range of 50 mK to 300 K.Hexaiodobenzene (C_6I_6) has a similar molecular structure to iodanil and is a good example to study the mechanism of the pressure-induced metallization of organic monomolecular crystals. We observed an insulator-to-metal transition at 35 GPa for hexaiodobenzene and superconductivity around 2 K in the metallic phase and these value was found to be closed to those of iodanil.

在同类有机化合物中，碘在实测压力为30 GPa时表现出最好的电导率，在最高压力区域没有表现出电阻率上升的趋势。这些简单有机晶体的金属化在与基于自由基阳离子或阴离子盐的其他导体的比较中很有趣。在碘丹尼尔的情况下，据报道，在 52 GPa 的压力和约 2 K 的温度下，超导转变导致电阻下降。是第一个成为超导的单体晶体。为了研究包括碘丹尼尔在内的有机单体晶体的金属化和超导机理，我们在50 mK至300 K的宽温度范围内测量了六碘苯在压力下的电阻。六碘苯（C_6I_6）具有与碘丹尼尔相似的分子结构，是研究有机单分子晶体压力诱导金属化机理的一个很好的例子。我们观察到六碘苯在 35 GPa 的压力下发生绝缘体到金属的转变，并在金属相中观察到 2 K 左右的超导性，并且发现这些值与碘的值接近。

项目成果

Atsuko Nakayama: "Raman Investigation of Hexaiodobenzene under High Pressure"Proceedings of AIRAPT-17 International Conference on High Pressure Science and Technology (Honolulu,1999). 2. 407-408 (2000)

Atsuko Nakayama：“高压下六碘苯的拉曼研究”AIRAPT-17 国际高压科学技术会议论文集（檀香山，1999 年）。

A.Nakayama: "Structural study on pressure-induced metallization of C_6I_6"International Conference on Science and Technology of Synthetic Metals (ICSM2000, Bad Gastein, Austria). (in press.).

A.Nakayama：“C_6I_6 压力诱导金属化的结构研究”国际合成金属科学与技术会议（ICSM2000，奥地利巴德加斯坦）。

Atsuko Nakayama: "Structural change of iodanil under high pressure"Synthetic Metals. 103. 1901-1902 (1999)

中山敦子：“碘在高压下的结构变化”合成金属。

E.Iwasaki: "Metallization and superconductivity in hexaiodobenzene under high pressure"International Conference on Science and Technology of Synthetic Metals(ICSM2000,Bad Gastein,Austria), in press.

E.Iwasaki：“高压下六碘苯的金属化和超导性”国际合成金属科学技术会议（ICSM2000，巴德加斯坦，奥地利），印刷中。

Ichimin Shirotani: "Anomalous Absorption Spectra of Highly Oriented Thin Films of Triphenothiaselenazine,TPTS,"Chem.Phys.Lett.. 304. 299-302 (1999)

白谷一民：“三酚噻烯嗪高度取向薄膜的反常吸收光谱，TPTS”，Chem.Phys.Lett.. 304. 299-302 (1999)