Darminto D, Smilde H-J H, Leca V, Blank D H A, Rogalla H, Hilgenkamp H
Technology and MESA+ Research Institute [corrected] University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
Phys Rev Lett. 2005 Apr 29;94(16):167001. doi: 10.1103/PhysRevLett.94.167001. Epub 2005 Apr 27.
Phase-sensitive order parameter symmetry test experiments are presented on the electron-doped high-T(c) cuprate Nd(2-x)Ce(x)CuO(4-y). These experiments have been conducted using zigzag-shaped thin film Josephson structures, in which the Nd(2-x)Ce(x)CuO(4-y) is connected to the low-T(c) superconductor Nb via an Au barrier layer. For the optimally doped as well as for the overdoped Nd(2-x)Ce(x)CuO(4-y), a clear predominant d(x2-y2)-wave behavior is observed at T=4.2 K. Both compounds were also investigated at T=1.6 K, presenting no indications for a change to a predominant s-wave symmetry with decreasing temperature.
对电子掺杂的高温铜酸盐Nd(2 - x)Ce(x)CuO(4 - y)进行了相敏序参量对称性测试实验。这些实验是使用锯齿形薄膜约瑟夫森结构进行的，其中Nd(2 - x)Ce(x)CuO(4 - y)通过金阻挡层与低温超导体Nb相连。对于最佳掺杂以及过掺杂的Nd(2 - x)Ce(x)CuO(4 - y)，在T = 4.2 K时观察到明显的主导d(x2 - y2)波行为。这两种化合物在T = 1.6 K时也进行了研究，没有迹象表明随着温度降低会转变为主导的s波对称性。
