V. G.对Phys. Rev. B 83，054515（2011）的评论。Kogan和J. Schmalian并评论他们的回复Phys. Rev. B 86，016502（2012）
Comment on Phys. Rev. B 83, 054515 (2011) by V. G. Kogan and J. Schmalian and comment on their reply Phys. Rev. B 86, 016502 (2012)
摘要：
V.G. Kogan和J. Schmalian Phys.Rev.B83，054515（2011）认为广泛使用的双组分Ginzburg-Landau（GL）模型是不正确的，并进一步得出结论，在由GL理论描述的区域中，两个超导组分的相干长度不可能有差异。这特别意味着（与$U(1)\times U(1)$超导体相反），对于任何有限的带间耦合强度，在U（1）多带系统中不可能存在“1.5型”超导体系。我们指出，这些索赔是不正确的，并根据一个错误的计划减少的两个组件GL理论。我们还附上了对Kogan和Schmalian的答复的单独答辩。在他们对我们的评论Phys. Rev. B 86，016501（2012）的回复中，Kogan和Schmalian没有反驳，也没有讨论评论中的批评要点。不幸的是，他们反而提出了关于双带和1.5型超导性的新的不正确的主张。所附复辩的主要目的是讨论这些新的不正确的主张。
英文摘要：
The recent paper by V. G. Kogan and J. Schmalian Phys. Rev. B 83, 054515 (2011) argues that the widely used two-component Ginzburg-Landau (GL) models are not correct, and further concludes that in the regime which is described by a GL theory there could be no disparity in the coherence lengths of two superconducting components. This would in particular imply that (in contrast to $U(1)\times U(1)$ superconductors), there could be no "type-1.5" superconducting regime in U(1) multiband systems for any finite interband coupling strength. We point out that these claims are incorrect and based on an erroneous scheme of reduction of a two-component GL theory. We also attach a separate rejoinder on reply by Kogan and Schmalian. In their reply Phys. Rev. B 86, 016502 (2012) to our comment Phys. Rev. B 86, 016501 (2012) Kogan and Schmalian did not refute or, indeed, discuss the main points of criticism in the comment. Unfortunately they instead advance new incorrect claims regarding two-band and type-1.5 superconductivity. The main purpose of the attached rejoinder is to discuss these new incorrect claims.
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