非孪晶高温超导体面内磁各向异性费米液体理论的困难
Difficulty in the Fermi-Liquid-Based Theory for the In-Plane Magnetic Anisotropy in Untwinned High-T_c Superconductor
摘要：
最近，Eremin和Manske [1]提出了非孪晶高温超导体YBa_2Cu_3O_（6：85）面内磁各向异性的单带费米液体理论。他们声称，他们发现与非弹性中子散射（INS）谱很好的一致性。本文指出，由于YBCO晶格结构的正交性δ_0在逻辑上的错误，他们在这一重要问题上的结论可能是有问题的。在文献[1]中，未孪晶YBCO的角分辨光电子能谱（ARPES）证实了δ_0>0处的单带。但在PRL[3]的勘误表中，他们承认使用delta_0= -0.03拟合INS数据。因此，出版物[1，3]包含错误，我们认为他们的方法无效。
英文摘要：
Recently, Eremin and Manske [1] presented a oneband Fermi-liquid theory for the in-plane magnetic anisotropy in untwinned high-Tc superconductor YBa2Cu3O6:85 (YBCO). They claimed that they found good agreement with inelastic neutron scattering (INS) spectra. In this Comment, we point out that their conclusion on this important problem may be questionable due to an error in logic about the orthorhombicity delta_0 characterizing the lattice structure of YBCO. In Ref. [1], a single band at delta_0>0 is proved to be in accordance with the angle resolved photoemission spectroscopy (ARPES) on untwinned YBCO. But in their Erratum in PRL[3], they admit that delta_0= -0.03 was used to fit the INS data. Hence publications [1,3] contain errors that we believe invalidate their approach.
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