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arXiv 0906.0621cond-mat.str-el
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高Tc化合物中的dHvA振荡

dHvA Oscillations in High-Tc Compounds

L. Thompson, P. C. E. Stamp

摘要:

最近的de Haas-van Alphen(dHvA)高Tc化合物的实验已经用Lifshitz-Kosevich(LK)理论解释,该理论忽略了多体效应。然而在准二维系统中,相互作用加上朗道能级量子化在自能$Σ$和热力学势$Ω$中给出了强奇异性。当增加c轴隧穿振幅$t_\perp$和/或杂质散射时,这些被迅速抑制。我们表明,2D-3D交叉和相互作用的影响应该出现在这些实验中,它们可能会导致从LK行为的强烈偏差。此外,dHvA实验在准2D系统应明确区分费米液体和非费米液体状态,足够弱的杂质散射。

英文摘要:

Recent de Haas-van Alphen (dHvA) experiments on high-Tc compounds have been interpreted using Lifshitz-Kosevich (LK) theory, which ignores many-body effects. However in quasi-2d systems, interactions plus Landau level quantization give strong singularities in the self-energy $Σ$ and the thermodynamic potential $Ω$. These are rapidly suppressed as one increases the c-axis tunneling amplitude $t_\perp$ and/or impurity scattering. We show that 2d-3d crossover and interaction effects should show up in these experiments, and that they can lead to strong deviations from LK behaviour. Moreover, dHvA experiments in quasi-2d systems should clearly distinguish between Fermi liquid and non-Fermi liquid states, for sufficiently weak impurity scattering.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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