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Low-frequency dynamics of κ-(BEDT-TTF)2Cu(NCS)2 observed by 13C NMR
| Title: | Low-frequency dynamics of κ-(BEDT-TTF)2Cu(NCS)2 observed by 13C NMR |
| Authors: | Kuwata, Yuki Browse this author | | Itaya, Megumi Browse this author | | Kawamoto, Atsushi Browse this author |
| Issue Date: | 1-Apr-2011 |
| Publisher: | American Physical Society |
| Journal Title: | Physical Review B |
| Volume: | 83 |
| Issue: | 14 |
| Start Page: | 144505 |
| Publisher DOI: | 10.1103/PhysRevB.83.144505 |
| Abstract: | κ-(BEDT-TTF)2Cu(NCS)2 [BEDT-TTF: bis-(ethylenedithio)-tetrathiafulvalene] behaves as a semiconductor at high temperatures, whereas it behaves as a Fermi liquid just above the superconducting transition temperature. To reveal the cause of this behavior, we experimented on κ-(BEDT-TTF)2Cu(NCS)2, in which one side of the central C=C in the BEDT-TTF molecules is substituted with 13C nuclei. We perfomed 13C-nuclear magnetic resonance (NMR) spectroscopy on this salt and measured the temperature dependence of its spectral linewidths and its spin-spin relaxation time T2. We found anomalies in its linewidths and T2, which we connected to the ethylene motion within the salt. Compared with the 13C-NMR measurements of κ-(BEDT-TTF-d8)2Cu(NCS)2, we obtained the experimental evidence of the connection between the ethylene motion and the conduction electrons. Considering this connection, we examined the semiconductive behavior of κ-(BEDT-TTF)2Cu(NCS)2 at high temperatures. The contribution of ethylene motion to the electronic state is thought to be a common feature of BEDT-TTF salts. |
| Rights: | ©2011 American Physical Society |
| Type: | article |
| URI: | http://hdl.handle.net/2115/45253 |
| 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: 河本 充司
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