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Microscopic modulation of local density of states in superconducting alpha-(BEDT-TTF)(2)NH4Hg(SCN)(4) studied by site-selective C-13-NMR spectroscopy
| Title: | Microscopic modulation of local density of states in superconducting alpha-(BEDT-TTF)(2)NH4Hg(SCN)(4) studied by site-selective C-13-NMR spectroscopy |
| Authors: | Ihara, Y. Browse this author →KAKEN DB | | Noda, K. Browse this author | | Kawamoto, A. Browse this author |
| Issue Date: | 25-Jul-2014 |
| Publisher: | American Physical Society |
| Journal Title: | Physical Review B |
| Volume: | 90 |
| Issue: | 4 |
| Start Page: | 41107 |
| Publisher DOI: | 10.1103/PhysRevB.90.041107 |
| Abstract: | 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. |
| Rights: | ©2014 American Physical Society |
| Type: | article |
| URI: | http://hdl.handle.net/2115/56911 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 井原 慶彦
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