Spin-zero anomaly in the magnetic quantum oscillations of a two-dimensional metal

Spin-zero anomaly in the magnetic quantum oscillations of a two-dimensional metal
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二维金属磁量子振荡中的自旋零异常

DOI:
10.1088/1367-2630/10/8/083032
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发表时间:
2008
影响因子:
3.3
通讯作者:
Wosnitza J
Wosnitza J
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wosnitza J

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本文报道了准二维有机超导体de Haas-van Alphen (dHvA)信号中自旋分裂零的反常行为。二次谐波振幅的零点和角依赖性明显偏离标准Lifshitz-Kosevich (LK)预测。相反,基本dHvA振幅的角依赖性以及Shubnikov-de Haas (SdH)信号的自旋分裂零点遵循LK理论。我们可以用小的化学势(CP)振荡来解释dHvA信号的这种行为,并在理论和实验之间找到了很好的一致性。对dHvA振荡的详细波形分析证实了振荡CP的存在。我们讨论了SdH信号中不存在上述自旋零效应,并认为在β " -(BEDT-TTF) 2 SF 5 CH 2 CF 2 SO 3中,它可以用对小CP振荡不敏感的非相干变跳距层间输运来解释。
We report on an anomalous behavior of the spin-splitting zeros in the de Haas–van Alphen (dHvA) signal of a quasi-two-dimensional organic superconductor. The zeros as well as the angular dependence of the amplitude of the second harmonic deviate remarkably from the standard Lifshitz–Kosevich (LK) prediction. In contrast, the angular dependence of the fundamental dHvA amplitude as well as the spin-splitting zeros of the Shubnikov–de Haas (SdH) signal follow the LK theory. We can explain this behavior of the dHvA signal by small chemical-potential (CP) oscillations and find a very good agreement between theory and experiment. A detailed wave-shape analysis of the dHvA oscillations corroborates the existence of an oscillating CP. We discuss the absence of the above spin-zero effect in the SdH signal and argue that in β''-(BEDT-TTF) 2 SF 5 CH 2 CF 2 SO 3 it can be explained by an incoherent variable range hopping interlayer transport which is insensitive to the small CP oscillations.
DOI: --
发表时间: 2005
期刊:
影响因子: --
作者:
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通讯作者: J. Wosnitza
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DOI: --
发表时间: 1996
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有机超导体 beta(")-(BEDT-TTF)2SF5CH2CF2SO3 中朗道能级之间的热活化。
DOI: --
发表时间: 2001
影响因子: 8.6
作者:
M.;A. Ardavan;J. Symington;J. Singleton;Neil Harrison;Charles H. Mielke;J. Schlueter;R. Winter;G. L. Gard
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