Fermi surface and internal magnetic field of the organic conductors λ-(BETS)2FexGa1-xCl4
Fermi surface and internal magnetic field of the organic conductors λ-(BETS)2FexGa1-xCl4
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有机导体 λ-(BETS)2FexGa1-xCl4 的费米表面和内部磁场
DOI：
10.1103/physrevb.65.113101
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发表时间：
2002
影响因子：
3.7
通讯作者：
H. Kobayashi
中科院分区：
文献类型：
--
作者：
S. Uji;C. Terakura;T. Terashima;T. Yakabe;Y. Terai;M. Tokumoto;A. Kobayashi;F. Sakai;Hisaaki Tanaka;H. Kobayashi
研究了有机导体λ-（BETS）2 FexGa 1 -xCl 4（x = 0，0.45，0.78和1.0）的Shubnikov-de哈斯（SdH）振荡.尽管磁相不同，但它们的费米面没有明显的差别。所有的盐具有相似的圆柱形费米表面，其横截面积对应于第一布里渊区的约15%。当x ≥ 0时，观察到两个不同的SdH频率，这是由于局域Fe磁矩和传导电子自旋之间的交换相互作用引起的内磁场H J.当x = 1.0时，H J值估计为32 T，并随x的减小而减小。大的H_j值表明λ-（BETS）2FeCl 4的场致超导性可以用Jaccarino-Peter效应来理解。
Shubnikov-de Haas (SdH) oscillations have been examined for organic conductors λ-(BETS) 2 Fe x Ga 1 - x Cl 4 (x = 0, 0.45, 0.78, and 1.0). In spite of the variety of the magnetic phases, no significant difference is found inthe Fermi surface among them. All the salts have similar cylindrical Fermi surfaces, whose cross-sectional areas correspond to ∼ 15% of the first Brillouin zone. For x ≠ 0, two different SdH frequencies are observed, which are ascribed to the internal magnetic field H J due to the exchange interaction between the localized Fe moments and the conduction electron spins. The value of H J for x = 1.0 is estimated to be 32 T and decreases with decreasing x. The large Hj suggests that the field-induced superconductivity for λ-(BETS) 2 FeCl 4 is understood in terms of the Jaccarino-Peter effect.