- 著者
- Hattori T. Ihara Y. Nakai Y. Ishida K. Tada Y. Fujimoto S. Kawakami N. Osaki E. Deguchi K. Sato N. Satoh I.
- 出版者
- American Physical Society
- 雑誌
- Physical Review Letters (ISSN:00319007)
- 巻号頁・発行日
- vol.108, no.6, 2012-02
- 被引用文献数
- 115
磁石でありながら超伝導にもなる物質の超伝導発現の新しい仕組みを解明 -磁石が生み出す超伝導-. 京都大学プレスリリース. 2012-02-07.
- 著者
- Ihara Y. Noda K. Kawamoto A.
- 出版者
- American Physical Society
- 雑誌
- Physical Review B (ISSN:10980121)
- 巻号頁・発行日
- vol.90, no.4, pp.41107, 2014-07-25
- 被引用文献数
- 6
The local electronic state at every crystallographically independent molecular site was separately investigated in the organic superconductor alpha-(BEDT-TTF)(2)NH4Hg(SCN)(4) using site-selective C-13-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 alpha-(BEDT-TTF)(2)RbHg(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 alpha-type BEDT-TTF family, and summarized the competition between charge instability and superconductivity.