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Spin-density wave in the vicinity of superconducting state in lambda-(BETS)(2)GaBrxCl4-x probed by C-13 NMR spectroscopy
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| Title: | Spin-density wave in the vicinity of superconducting state in lambda-(BETS)(2)GaBrxCl4-x probed by C-13 NMR spectroscopy |
| Authors: | Kobayashi, T. Browse this author | | Ishikawa, T. Browse this author | | Ohnuma, A. Browse this author | | Sawada, M. Browse this author | | Matsunaga, N. Browse this author | | Uehara, H. Browse this author | | Kawamoto, A. Browse this author →KAKEN DB |
| Issue Date: | 24-Apr-2020 |
| Publisher: | American Physical Society (APS) |
| Journal Title: | Physical Review Research |
| Volume: | 2 |
| Issue: | 2 |
| Start Page: | 023075 |
| Publisher DOI: | 10.1103/PhysRevResearch.2.023075 |
| Abstract: | C-13 NMR and electrical resistivity of lambda-(BETS)(2)GaBr0.75Cl3.25 [BETS: bis(ethylenedithio) tetraselenafulvalene] were simultaneously measured to clarify the electronic state of the insulating phase near the boundary of the superconducting (SC) phase of lambda-(BETS)(2)GaCl4. We found the divergent peak in the nuclear spin-lattice relaxation rate divided by temperature 1/T1T with the metal-insulator transition at 13 K, below which the appearance of internal fields in NMR spectra was confirmed. Results of this study indicate that lambda-(BETS)(2)GaBr0.75Cl3.25 undergoes spin-density-wave (SDW) ordering. We suggest that the existence of the SDW phase in the vicinity of the SC phase can explain the unexplainable enhancement of 1/T1T at low temperatures observed in lambda-(BETS)(2)GaCl4, and SDW fluctuation plays an important role in the pairing mechanism of lambda-type BETS superconductors. |
| Rights: | https://creativecommons.org/licenses/by/4.0/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/80416 |
| 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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