Superconducting properties and Fermi-surface topology of the quasi-two-dimensional organic superconductor λ-(BETS)2GaCl4 (BETS≡bis(ethylene-dithio)tetraselenafulvalene)
Superconducting properties and Fermi-surface topology of the quasi-two-dimensional organic superconductor λ-(BETS)2GaCl4 (BETS≡bis(ethylene-dithio)tetraselenafulvalene)
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准二维有机超导体λ-(BETS)2GaCl4 (BETS≡bis(乙撑二硫)四硒富瓦烯)的超导性能和费米面拓扑
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
Lawrence K. Montgomery
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作者：
C. Mielke;J. Singleton;J. Singleton;M.;N. Harrison;C. Agosta;B. Fravel;Lawrence K. Montgomery
利用舒布尼科夫-德哈斯效应和磁击穿效应以及角相关磁阻振荡，确定了有机超导体λ-(BETS)2GaCl4的费米表面拓扑结构。前脉冲领域的实验进行了60 T,而后者采用准静态领域30 T .所有这些数据显示,λ的费密面拓扑——(赌注)2 gacl4非常类似于最严重的研究有机超导体,κ- (BEDT-TTF) 2铜(nc) 2 (BEDT-TTF≡bis (ethylene-dithio) tetrathiafulvalene),除了一个重要的方面:λ的interplane转移积分-(赌注)2 gacl4是一个因素~ 5比κ- (BEDT-TTF) 2铜(nc) 2。λ-(BETS)2GaCl4的三维度增加在射频穿透深度测量中得到了体现，在Hc2(T)的行为中显示出明显的维度交叉。射频测量还用于提取确定流体相互作用作为温度函数的Labusch参数，并绘制通量-晶格熔化曲线。
The Fermi-surface topology of the organic superconductor λ-(BETS)2GaCl4 has been determined using the Shubnikov-de Haas and magnetic breakdown effects and angle-dependent magnetoresistance oscillations. The former experiments were carried out in pulsed fields of up to 60 T, whereas the latter employed quasistatic fields of up to 30 T. All of these data show that the Fermi-surface topology of λ-(BETS)2GaCl4 is very similar to that of the most heavily studied organic superconductor, κ-(BEDT-TTF)2Cu(NCS)2 (BEDT-TTF≡bis(ethylene-dithio)tetrathiafulvalene), except in one important respect: the interplane transfer integral of λ-(BETS)2GaCl4 is a factor ~5 larger than that of κ-(BEDT-TTF)2Cu(NCS)2. The increased three-dimensionality of λ-(BETS)2GaCl4 is manifested in radio-frequency penetration-depth measurements, which show a clear dimensional crossover in the behaviour of Hc2(T). The radio-frequency measurements have also been used to extract the Labusch parameter determining the fluxoid interactions as a function of temperature, and to map the flux-lattice melting curve.