Enhanced magnetic quantum oscillations in the mixed state of a two-dimensional organic superconductor
Enhanced magnetic quantum oscillations in the mixed state of a two-dimensional organic superconductor
复制标题
二维有机超导体混合态的增强磁量子振荡
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
G. L. Gard
中科院分区：
文献类型：
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作者：
J. Wosnitza;J. Hagel;P. Meeson;D. Bintley;J. Schlueter;J. Mohtasham;R. Winter;G. L. Gard
本文报道了利用磁场调制技术和转矩磁强计在有机超导体β"-（BEDT-TTF）2SF 5CH 2CF 2SO 3（BEDT-TTF代表双乙撑二硫代四硫富瓦烯）混合态中观察到的deHaas-van Alphen（dHvA）振荡。在低温（30 mK）下，dHvA信号持续下降到1.4 T，远低于上临界场B c 2 3.6 T。与大多数理论预测和以前的实验结果相反，没有额外的dHvA振荡振幅的阻尼，但减少dHvA信号的阻尼被发现，这种极不寻常的效果可能表明减少准粒子散射率或额外的振荡贡献超导状态。
We report on de Haas-van Alphen (dHvA) oscillations observed in the mixed state of the organic superconductor β"-(BEDT-TTF) 2 SF 5 CH 2 CF 2 SO 3 (BEDT-TTF stands for bisethylenedithio-tetrathiafulvalene) utilizing the field-modulation technique and torque magnetometry. At low temperatures (30 mK), the dHvA signal persists down to 1.4 T well below the upper critical field B c 2 3.6 T. Contrary to most theoretical predictions and previous experimental findings, no additional damping of the dHvA-oscillation amplitude, but a reduced damping of the dHvA signal is found. This highly unusual effect might indicate a reduced quasiparticle scattering rate or an additional oscillatory contribution in the superconducting state.