Tsuei CC, Kirtley JR
IBM T. J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598, USA.
Phys Rev Lett. 2000 Jul 3;85(1):182-5. doi: 10.1103/PhysRevLett.85.182.
We present phase-sensitive evidence that the electron-doped cuprates Nd(1.85)Ce(0.15)CuO(4-y) (NCCO) and Pr(1.85)Ce(0.15)CuO(4-y) (PCCO) have d-wave pairing symmetry. This evidence was obtained by observing the half-flux quantum effect, using a scanning SQUID microscope, in c-axis-oriented films of NCCO or PCCO epitaxially grown on tricrystal [100] SrTiO3 substrates designed to be frustrated for a d(x(2)-y(2)) order parameter. Samples with two other configurations, designed to be unfrustrated for a d-wave superconductor, do not show the half-flux quantum effect.
我们提供了相敏证据，表明电子掺杂铜酸盐Nd(1.85)Ce(0.15)CuO(4 - y)（NCCO）和Pr(1.85)Ce(0.15)CuO(4 - y)（PCCO）具有d波配对对称性。该证据是通过使用扫描超导量子干涉装置显微镜观察半磁通量子效应获得的，该装置用于观察在设计用于使d(x(2)-y(2))序参量受挫的三晶[100] SrTiO3衬底上外延生长的NCCO或PCCO的c轴取向薄膜。另外两种设计用于使d波超导体不受挫的配置的样品未显示出半磁通量子效应。
