The influence of out-of-plane disorder on the formation of pseudogap and Fermi arc in Bi2Sr2−xRxCuOy (R=La and Eu)

The influence of out-of-plane disorder on the formation of pseudogap and Fermi arc in Bi2Sr2−xRxCuOy (R=La and Eu)
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面外无序对 Bi2Sr2−xRxCuOy (R=La 和 Eu) 中赝能隙和费米弧形成的影响

DOI:
10.1016/j.jpcs.2008.06.007
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发表时间:
2007
影响因子:
4
通讯作者:
H. Ikuta
H. Ikuta
中科院分区:
材料科学3区
文献类型:
--
作者:
Y. Okada;T. Takeuchi;A. Shimoyamada;S. Shin;H. Ikuta

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我们发现费米弧的长度随着面外无序的增加而减小,这是通过在最佳掺杂的R=La和Eu的Bi2Sr2−xRxCuOy样品的超导状态下进行角分辨光电子能谱(ARPES)测量得到的。由于面外无序稳定了正常态的波腹赝能隙,本研究结果表明,这种波腹赝能隙持续到超导态,并减小了费米弧长度。我们认为费米弧的收缩降低了超流密度,这解释了当面外无序增加时超导转变温度的大幅度抑制。
We found that the length of the Fermi arc decreases with increasing out-of-plane disorder by performing angle resolved photoemission spectroscopy (ARPES) measurements in the superconducting state of optimally doped R=La and Eu samples of Bi2Sr2−xRxCuOy. Since out-of-plane disorder stabilizes the antinodal pseudogap as was shown in our previous study of the normal state, the present results indicate that this antinodal pseudogap persists into the superconducting state and decreases the Fermi arc length. We think that the shrinkage of the Fermi arc reduces the superfluid density, which explains the large suppression of the superconducting transition temperature when out-of-plane disorder is increased.
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