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Non-Fermi-liquid behavior of the organic superconductor κ-(BEDT-TTF)4Hg2.89Br8 probed by 13C NMR
| Title: | Non-Fermi-liquid behavior of the organic superconductor κ-(BEDT-TTF)4Hg2.89Br8 probed by 13C NMR |
| Authors: | Eto, Yoshihiro Browse this author | | Itaya, Megumi Browse this author | | Kawamoto, Atsushi Browse this author |
| Issue Date: | 21-Jun-2010 |
| Publisher: | American Physical Society |
| Journal Title: | Physical Review B |
| Volume: | 81 |
| Issue: | 21 |
| Start Page: | 212503 |
| Publisher DOI: | 10.1103/PhysRevB.81.212503 |
| Abstract: | An organic salt, κ-(BEDT-TTF)4Hg2.89Br8 exhibits superconductivity at 4.3 K under ambient pressure suggesting non-Fermi-liquid (NFL) behavior just above Tc. Whereas most organic superconductors are controlled by the bandwidth in the half-filled electron system, this salt realizes a carrier doping away from the half-filled electron system as well as high-Tc cuprates. In order to investigate the origin of NFL behavior, we assessed 13C-NMR measurements in this salt and observed the antiferromagnetic fluctuation as same as in an organic antiferromagnet κ-(BEDT-TTF)2Cu[N(CN)2]Cl with the gap structure. Application of pressure suppresses (T1T)^[-1] and shifts its maximum to lower temperatures with (T1T)^[-1] becoming constant above 2 GPa. These results suggest that applying pressure alters the electron system from NFL to FL state and that antiferromagnetic fluctuations contribute to the origin of NFL behavior. |
| Rights: | ©2010 The American Physical Society |
| Type: | article |
| URI: | http://hdl.handle.net/2115/43202 |
| 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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