通过角分辨光电子能谱在高温超导体中观测到类BCS的博戈留波夫准粒子
BCS-like Bogoliubov quasiparticles in high-T(c) superconductors observed by angle-resolved photoemission spectroscopy.
作者信息
Matsui H, Sato T, Takahashi T, Wang S-C, Yang H-B, Ding H, Fujii T, Watanabe T, Matsuda A
机构信息
Department of Physics, Tohoku University, Sendai 980-8578, Japan.
出版信息
Phys Rev Lett. 2003 May 30;90(21):217002. doi: 10.1103/PhysRevLett.90.217002. Epub 2003 May 29.
We performed high-resolution angle-resolved photoemission spectroscopy on triple-layered high-T(c) cuprate Bi(2)Sr(2)Ca(2)Cu(3)O(10+delta). We have observed the full energy dispersion (electron and hole branches) of Bogoliubov quasiparticles and determined the coherence factors above and below E(F) as a function of momentum from the spectral intensity as well as from the energy dispersion based on BCS theory. The good quantitative agreement between the experiment and the theoretical prediction suggests the basic validity of BCS formalism in describing the superconducting state of cuprates.
我们对三层高温铜酸盐Bi(2)Sr(2)Ca(2)Cu(3)O(10+δ)进行了高分辨率角分辨光电子能谱实验。我们观测到了博戈留波夫准粒子的完整能量色散（电子和空穴分支），并根据BCS理论，从光谱强度以及能量色散确定了费米能级上下的相干因子作为动量的函数。实验与理论预测之间良好的定量一致性表明，BCS形式理论在描述铜酸盐超导态方面具有基本的有效性。
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