CHEN Zhenping1 LI Xigui2 SU Yuling1 XUE Yuncai1 LIU Haizeng1 GONG Shicheng1 ZHAO Jingxun1 1. Positron annihilation study on the superconductivity of Gd-doped YBCO system[J]. Nuclear techniques, 2006, (1): 33-36.
CHEN Zhenping1 LI Xigui2 SU Yuling1 XUE Yuncai1 LIU Haizeng1 GONG Shicheng1 ZHAO Jingxun1 1. Positron annihilation study on the superconductivity of Gd-doped YBCO system[J]. Nuclear techniques, 2006, (1): 33-36.DOI:
To make clear the influence of magnetic rare-earth ion Gd3+ doping in the Y site on crystal structure and localized electron structure of YBCO system
the Gd-doped Y1-xGdxBa2Cu3O7-δ (x=0—1.0) systems were studied systematically by the positron annihilation technique and X-ray diffraction (XRD). The XRD analysis reveals that Gd3+ with bigger radius doping in Y site makes the crystal parameters and crystal volume increase
while all the samples remain the single orthorhombic phase as YBa2Cu3O7-δ (YBCO) system does. The temperature dependence of resistance measurement shows that Tc is above 90 K for all samples
and Tc increases with increasing Gd3+ content. The positron experiment indicates that the localized electronic density ne decreases with increasing Gd3+ content.