Tsuei C C, Kirtley J R, Hammerl G, Mannhart J, Raffy H, Li Z Z
IBM Watson Research Center, Yorktown Heights, New York, USA.
Phys Rev Lett. 2004 Oct 29;93(18):187004. doi: 10.1103/PhysRevLett.93.187004. Epub 2004 Oct 27.
Although initially quite controversial, it is now widely accepted that the Cooper pairs in optimally doped cuprate superconductors have predominantly dx2-y2 wave function symmetry, and the controversy has now shifted to whether the pairing symmetry changes away from optimal doping. Here we present phase-sensitive tricrystal experiments on three cuprate systems: Y(0.7)Ca(0.3)Ba(2)Cu(3)O(7-delta) (Ca-doped Y-123), La2-xSrxCuO4 (La-214), and Bi(2)Sr(2)CaCu(2)O(8+delta) (Bi-2212), with doping levels covering the underdoped, optimal, and overdoped regions. Our work implies that predominantly d x2-y2 pairing symmetry is robust over a large variation in doping.
尽管最初颇具争议，但现在人们已广泛接受，最佳掺杂铜酸盐超导体中的库珀对主要具有dx2-y2波函数对称性，而争议现已转向配对对称性在远离最佳掺杂时是否会发生变化。在此，我们展示了对三种铜酸盐体系进行的相敏三晶实验：Y(0.7)Ca(0.3)Ba(2)Cu(3)O(7-δ)（钙掺杂Y-123）、La2-xSrxCuO4（La-214）和Bi(2)Sr(2)CaCu(2)O(8+δ)（Bi-2212），其掺杂水平涵盖欠掺杂、最佳掺杂和过掺杂区域。我们的工作表明，在很大的掺杂变化范围内，主要的dx2-y2配对对称性是稳健的。
