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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

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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)

Submitter: 井原 慶彦

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