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arXiv 0704.1698cond-mat.supr-concond-mat.str-el
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面外无序对高温超导电性强烈影响的原因

The origin of the anomalously strong influence of out-of-plane disorder on high-Tc superconductivity

Y. Okada, T. Takeuchi, T. Baba, S. Shin, H. Ikuta

摘要:

用角分辨光电子能谱(ARPES)研究了Bi_2Sr_(2-x)R_xCu_(Oy)(R=La,Eu)晶体第一布里渊区(pi,0)点附近的电子结构.温度T* 以上的赝能隙结构在ARPES谱消失被发现有一个R的依赖性,这是相反的超导转变温度Tc。这表明赝能隙态与高Tc超导性竞争,并且随着面外无序的增加而观察到的大Tc抑制是由于赝能隙态的稳定化。

英文摘要:

The electronic structure of Bi2Sr2-xRxCuOy(R=La, Eu) near the (pi,0) point of the first Brillouin zone was studied by means of angle-resolved photoemission spectroscopy (ARPES). The temperature T* above which the pseudogap structure in the ARPES spectrum disappears was found to have an R dependence that is opposite to that ofthe superconducting transition temperature Tc. This indicates that the pseudogap state is competing with high-Tc superconductivity, and the large Tc suppression observed with increasing the out-of-plane disorder is due to the stabilization of the pseudogap state.

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