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arXiv 1402.2639cond-mat.supr-concond-mat.str-el
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赝能隙对铜酸盐T $_c$的影响及其起源

Effect of the pseudogap on T$_c$ in the cuprates and implications for its origin

Vivek Mishra, U. Chatterjee, J. C. Campuzano, M. R. Norman

摘要:

铜氧化物的最有趣的方面之一是一个大的赝能隙与高的超导转变温度共存。在这里,我们研究配对中的铜酸盐从电子-电子相互作用,通过构建对顶点使用的光谱函数来自角度分辨的光电发射数据为近最佳掺杂的Bi $_2$ Sr $_2$ CaCu $_2$ O $_{8+δ}$样品,具有明显的赝隙。假设赝能隙是{ \it not},我们发现超导不稳定性被强烈抑制,与实际观察到的形成鲜明对比。使用的光谱函数的解析近似,我们可以跟踪这种抑制BCS对数奇异性的破坏的赝能隙和寿命加宽的组合。我们的研究结果强烈支持这些理论的pseudogap是由于配对的铜酸盐。

英文摘要:

One of the most intriguing aspects of cuprates is a large pseudogap coexisting with a high superconducting transition temperature. Here, we study pairing in the cuprates from electron-electron interactions by constructing the pair vertex using spectral functions derived from angle resolved photoemission data for a near optimal doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ sample that has a pronounced pseudogap. Assuming that that the pseudogap is {\it not} due to pairing, we find that the superconducting instability is strongly suppressed, in stark contrast to what is actually observed. Using an analytic approximation for the spectral functions, we can trace this suppression to the destruction of the BCS logarithmic singularity from a combination of the pseudogap and lifetime broadening. Our findings strongly support those theories of the cuprates where the pseudogap is instead due to pairing.

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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