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arXiv 1504.06347cond-mat.supr-con
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MgB2多带超导体超导能隙和带隙内超导态的动量依赖性

Momentum dependence of the superconducting gap and in-gap states in MgB2 multi-band superconductor

Daixiang Mou, Rui Jiang, Valentin Taufour, S. L. Bud'ko, P. C. Canfield, Adam Kaminski

摘要:

我们利用可调谐激光角分辨光电子能谱研究了多带超导体MgB_2的电子结构。这些结果构成了详细研究多带系统中超导性的基础。我们发现两个σ带上的超导能隙的大小随温度的变化服从BCS型变化,变化范围为Δ 0 ~7 meV。间隙的值在实验不确定性内是各向同性的,并且与纯s波配对对称性一致。我们还观察到的间隙状态局限于kF的σ带发生在样品表面的某些位置。这种激发的能量,~3 meV,与π带的散射不一致。

英文摘要:

We use tunable laser based Angle Resolved Photoemission Spectroscopy to study the electronic structure of the multi-band superconductor, MgB2. These results form the base line for detailed studies of superconductivity in multi-band systems. We find that the magnitude of the superconducting gap on both sigma bands follows a BCS-like variation with temperature with Delta0 ~7 meV. The value of the gap is isotropic within experimental uncertainty and in agreement with pure a s-wave pairing symmetry. We also observe in-gap states confined to kF of the sigma band that occur at some locations of the sample surface. The energy of this excitation, ~3 meV, is inconsistent with scattering from the pi band.

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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