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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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