Transition from a Metal to a Massless-Dirac-Fermion Phase in an Organic Conductor Investigated by <sup>13</sup>C NMR
作者: Kazuya MiyagawaYohta SataTomotaka TaniguchiMichihiro HirataDong LiuMasafumi TamuraKazushi Kanoda
刊名: Journal of the Physical Society of Japan, 2016, Vol.85 (7)
来源数据库: The physical Society of Japan
DOI: 10.7566/JPSJ.85.073710
原始语种摘要: The θ-(BEDT-TTF)2I3 system is suggested to be the second organic system of massless Dirac fermions, which emerge from the metallic phase at a pressure exceeding 5 kbar. We have performed 13C NMR measurements on a single crystal of θ-(BEDT-TTF)2I3 under variable pressure across the critical pressure, 5 kbar. The Knight shift and spin–lattice relaxation rate show that a metallic state with an NMR enhancement factor of 2.2–2.4 at ambient pressure persists up to the critical pressure of 5 kbar. Above that, a marked spectral change indicative of a first-order phase transition is found. The angular dependence of NMR spectra indicates a structural phase transition from the θ-type molecular arrangement to the α-type one, which hosts the...
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关键词翻译
关键词翻译
  • pressure 压力
  • lattice 
  • transition 转移
  • dependence 从属
  • crystal 晶体
  • structural 构造
  • ambient 外界的
  • massless 无质量的
  • metallic 金属的
  • single 单独的