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arXiv 0708.4099cond-mat.supr-concond-mat.str-el
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高温超导铜氧化物中的保护节点和费米弧的坍缩

Protected nodes and the collapse of the Fermi arcs in high Tc cuprates

A. Kanigel, U. Chatterjee, M. Randeria, M. R. Norman, S. Souma, M. Shi, Z. Z. Li, H. Raffy, J. C. Campuzano

摘要:

对欠掺杂Bi_2Sr_2CaCu_2O_8的角分辨光电子能谱研究表明,超导态能隙的大小和d波各向异性在Tc之前与温度无关。整个依赖于k的能隙的T变化的缺乏与平均场论形成鲜明对比。在Tc处,d波能隙的点节点突然扩展成有限长度的“费米弧”。这种变化发生在电阻转变的宽度内,因此费米弧不是简单的热加宽节点,而是赝能隙相的独特特征。

英文摘要:

Angle resolved photoemission on underdoped Bi2Sr2CaCu2O8 reveals that the magnitude and d-wave anisotropy of the superconducting state energy gap are independent of temperature all the way up to Tc. This lack of T variation of the entire k-dependent gap is in marked contrast to mean field theory. At Tc the point nodes of the d-wave gap abruptly expand into finite length ``Fermi arcs''. This change occurs within the width of the resistive transition, and thus the Fermi arcs are not simply thermally broadened nodes but rather a unique signature of the pseudogap phase.

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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