Electronic state anisotropy and the Fermi surface topology of the incommensurate organic superconducting crystal (MDT-TSF)(AuI$\mathsf{_2}$) $\mathsf{_{0.436}}$
Electronic state anisotropy and the Fermi surface topology of the incommensurate organic superconducting crystal (MDT-TSF)(AuI$\mathsf{_2}$) $\mathsf{_{0.436}}$
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不通约有机超导晶体(MDT-TSF)的电子态各向异性和费米表面拓扑(AuI$mathsf{_2}$) $mathsf{_{0.436}}$
DOI：
10.1140/epjb/e2003-00330-1
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
T. Otsubo
中科院分区：
文献类型：
--
作者：
T. Kawamoto;Takashi Mori;C. Terakura;T. Terashima;S. Uji;H. Tajima;K. Takimiya;Y. Aso;T. Otsubo
利用光学反射谱和角相关磁电阻振荡（AMRO）研究了具有无公度阴离子结构的有机超导体（MDT-TSF）（AuI 2）0.436（MDT-TSF：methylenedithio-tetraselenafulvalene）的费米面形状.层间和层内方向的等离子体频率差异表明，整体能带结构具有较小的各向异性（）。AMRO的观测表明存在一个小的闭合轨道，它可以被分配到大FS的重叠区域。这表明，无公度阴离子势是至关重要的，以消除区带边界上的能带的简并。在导电层内施加的磁场中的磁电阻峰显示了有机超导体之间异常大的层间转移积分（meV）。
The Fermi surface (FS) shape of the organic superconductor (MDT-TSF)(AuI2)0.436with an incommensurate anion structure (MDT-TSF: methylenedithio-tetraselenafulvalene) has been investigated by means of the optical reflectance spectra and angular-dependent magnetoresistance oscillations (AMRO). The difference of the plasma frequencies between the interstack and the intrastack directions indicates that the overall band structure has small anisotropy (). The observation of the AMRO shows the presence of a small closed orbit, which can be assigned to the overlapped area of the large FS. This demonstrates that the incommensurate anion potential is crucial to remove the degeneracy of the energy bands on the zone boundary. The magnetoresistance peak in the fields applied within the conducting layers shows an unusually large interlayer transfer integral (meV) among organic superconductors.