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Superconductivity and spin-density waves in multiband metals

机译：多频带金属中的超导电性和自旋密度波

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We present a detailed description of two-band quasi-two-dimensional metals with s-wave superconducting (SC) and antiferromagnetic spin-density-wave (SDW) correlations. We present a general approach and use it to investigate the influence of the difference between the shapes and the areas of the two Fermi surfaces on the phase diagram. In particular, we determine the conditions for the coexistence of SC and SDW orders at different temperatures and dopings. We argue that a conventional s-wave SC order coexists with SDW order only at very low T and in a very tiny range of parameters. An extended s-wave superconductivity, for which SC gap changes sign between the two bands, coexists with antiferromagnetic SDW over a much wider range of parameters and temperatures but even for this SC order the regions of SDW and SC can still be separated by a first-order transition. We show that the coexistence range becomes larger if SDW order is incommensurate. We apply our results to iron-based pnictide materials, in some of which coexistence of SDW and SC orders has been detected.
机译：我们对具有s波超导（SC）和反铁磁自旋密度波（SDW）相关性的两波段准二维金属进行详细描述。我们提出了一种通用方法，并用它来研究相图上两个费米表面的形状和面积之间的差异的影响。特别是，我们确定了在不同温度和掺杂条件下SC和SDW订单共存的条件。我们认为，常规的s波SC阶与SDW阶仅在非常低的T和很小的参数范围内共存。 SC间隙在两个频带之间改变符号的扩展的S波超导性，在更大的参数和温度范围内与反铁磁SDW共存，但即使对于这个SC阶，SDW和SC的区域仍然可以被第一个分开。顺序过渡。我们显示，如果SDW顺序不适当，则共存范围会变大。我们将我们的结果应用于基于铁的磷化物材料，其中一些已被发现同时存在SDW和SC订单。

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