Dichotomy between nodal and antinodal quasiparticles in underdoped (La2-xSrx)CuO4 superconductors.
Dichotomy between nodal and antinodal quasiparticles in underdoped (La2-xSrx)CuO4 superconductors.
复制标题
DOI：
10.1103/physrevlett.92.187001
复制
发表时间：
2004-03
影响因子：
8.6
通讯作者：
Xingjiang Zhou;T. Yoshida;D. Lee;Wanli Yang;V. Brouet;F. Zhou;W. Ti;J. Xiong;Z. Zhao;T. Sasagawa;T. Kakeshita;H. Eisaki;S. Uchida;A. Fujimori;Z. Hussain;Z. Shen
中科院分区：
文献类型：
--
作者：
Xingjiang Zhou;T. Yoshida;D. Lee;Wanli Yang;V. Brouet;F. Zhou;W. Ti;J. Xiong;Z. Zhao;T. Sasagawa;T. Kakeshita;H. Eisaki;S. Uchida;A. Fujimori;Z. Hussain;Z. Shen
对欠掺杂（La（2-x）Srx）CuO_4系统的高分辨角分辨光电子能谱测量表明，在能量低于70 meV时，准粒子峰在（pi/2，pi/2）节区附近有很好的定义，当动量从节点沿沿着下面的“费米面”向（pi，0）波腹点变化时，准粒子峰突然消失.“这表明有一种超低能散射机制作用于波腹准粒子。我们认为这种机制是准粒子在费米面的近平行部分的散射。
High resolution angle-resolved photoemission measurements on an underdoped (La(2-x)Srx)CuO4 system show that, at energies below 70 meV, the quasiparticle peak is well defined around the (pi/2,pi/2) nodal region and disappears rather abruptly when the momentum is changed from the nodal point to the (pi,0) antinodal point along the underlying "Fermi surface." It indicates that there is an extra low energy scattering mechanism acting upon the antinodal quasiparticles. We propose that this mechanism is the scattering of quasiparticles across the nearly parallel segments of the Fermi surface near the antinodes.