Kaminski A, Randeria M, Campuzano J C, Norman M R, Fretwell H, Mesot J, Sato T, Takahashi T, Kadowaki K
Department of Physics, University of Illinois at Chicago, 60607, USA.
Phys Rev Lett. 2001 Feb 5;86(6):1070-3. doi: 10.1103/PhysRevLett.86.1070.
Angle-resolved photoemission data in the superconducting state of Bi2Sr2CaCu2O8+delta show a kink in the dispersion along the zone diagonal, which is related via a Kramers-Krönig analysis to a drop in the low energy scattering rate. As one moves towards (pi,0), this kink evolves into a spectral dip. The occurrence of these anomalies in the dispersion and line shape throughout the zone indicates the presence of a new energy scale in the superconducting state.
Bi2Sr2CaCu2O8+δ超导态下的角分辨光电子能谱数据显示，沿布里渊区对角线方向的色散存在一个扭折，通过克莱默斯-克勒尼希分析可知，该扭折与低能散射率的下降有关。当向(π,0)方向移动时，这个扭折演变成一个光谱凹陷。在整个布里渊区内，色散和线形中出现的这些异常现象表明超导态中存在一个新的能量标度。
