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首页> 外文期刊>Zeitschrift fur Physik, B. Condensed Matter >Characterization of the Fermi Surface of the organic superconductor β'-(ET)_2SF_5CH_2CF_2SO_3 by measurements of Shubnikov-de Haas and angle-dependent magnetoresistance oscillations and by electronic band-structure calculations
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Characterization of the Fermi Surface of the organic superconductor β'-(ET)_2SF_5CH_2CF_2SO_3 by measurements of Shubnikov-de Haas and angle-dependent magnetoresistance oscillations and by electronic band-structure calculations

机译：通过测量Shubnikov-de Haas和角度相关的磁阻振荡并通过电子能带结构计算来表征有机超导体β“-（ET）_2SF_5CH_2CF_2SO_3的费米表面

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摘要

The electronic structure of the quasi two-dimensional (2D) organic superconductor β"-(ET)_2SF_5CH_2CF_2SO_3 was examined by measuring Shubnikov-de Haas (SdH) and angle-dependent magnetoresistance (AMRO) oscillations any by comparing with electronic band-structure calculations. The SdH oscillation frequencies follow the 1/cos Θ angular dependence expected for a 2D Fermi surface (FS), and the observed fundamental frequency shows that the 2D FS is 5% of the first Brillouin zone in size. The AMRO data indicate that the shape of the 2D FS is significantly non-circular. The calculated electronic structure has a 2D FS in general agreement with experiment. From the temperature and angular dependence of the SdH amplitude, the cyclotron and band effective masses were estimated to be m_c = (1.9 ± 0.05) m_e and m_b = (3.90 ± 0.05) m_b/g, where g is the conduction electron g factor and m_e the free electron mass. The band effective mass is estimated to be m'_b = 1.07 m_e from the calculated electronic band structure.
机译：通过测量Shubnikov-de Haas（SdH）和角度相关的磁阻（AMRO）振荡，并与电子能带结构计算进行比较，来研究准二维（2D）有机超导体β“-（ET）_2SF_5CH_2CF_2SO_3的电子结构。SdH振荡频率遵循2D费米面（FS）预期的1 / cosθ角依赖性，并且观察到的基频显示2D FS大小是第一个布里渊区的5％。 2D FS的形状明显是非圆形的，所计算的电子结构具有2D FS，与实验基本吻合。根据SdH振幅的温度和角度依赖性，回旋加速器和能带有效质量估计为m_c =（1.9 ±0.05）m_e和m_b =（3.90±0.05）m_b / g，其中g是传导电子g因子，m_e是自由电子质量，根据计算得出的电子，带有效质量估计为m'_b = 1.07 m_e nic乐队结构。

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