The effect of Gd diffusion-doped on structural and superconducting properties of YBa2Cu3O7-x superconductors

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Karadeniz Technical University, Faculty of Arts and Sciences, Department of Physics, Trabzon, Turkey [1 ]
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Journal of Alloys and Compounds | 2007年 / 433卷 / 1-2期
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The effect of Gd diffusion on structural evolution and superconducting properties of YBa2Cu3O7-x (Y123) prepared in the bulk polycrystalline form were studied. The gadolinium (Gd) diffusion in superconducting Y123 ceramic has been studied over the temperature range of 600-900 °C by energy dispersive X-ray fluorescence technique (EDXRF). The temperature dependence of Gd diffusion coefficient in grains (D1) and over the grain boundaries (D2) are described by the relations: D1 = 8.9 × 10-6 exp(-1.25/kT) and D2 = 2.3 × 10-5 exp(-1.09/kT). For the Gd diffused-doped samples; magnetization and resistivity measurements show that the critical transition temperature; Tc; increased from 88 to 91 K and the critical current density; Jc; which was calculated from M-H loops taken at 77 K; increased from 55 to 122 A cm-2 in comparison with those of undoped Y123. The possible reasons for the observed increases in Tc and Jc due to Gd diffusion were discussed. In addition; magnetic hysteresis curves of the Gd900; Gd800; Gd700 and undoped Y123 are presented for temperature of 5 K. It was found that the hysteresis is enhanced by the Gd diffusion. Such enhancement; which is considered to represent a characteristic strength of intergrain coupling; is more clearly recognized when critical current densities are compared. © 2006 Elsevier B.V. All rights reserved;
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