Influence of water vapor on the formation of pinning centers in YBa2Cu3Oy upon low-temperature annealing


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Abstract

The influence of the double heat treatment (T = 300 and 930°С) on the critical parameters of highly textured YBa2Cu3O6.96 and YBa2Cu3O6.8 ceramics has been investigated. It has been shown that, upon low-temperature annealing in humid air, planar stacking faults are formed in these ceramics. These defects are partly retained after reduction annealing (at T = 930°С) and are efficient pinning centers in magnetic fields applied parallel and perpendicular to the c axis. Due to the absorption of water, the oxygen content is increased in the ceramics, which is accompanied by an increase in the critical temperature of superconducting transition up to 94 K for YBa2Cu3O6.96 and up to 90 K for YBa2Cu3O6.8. Optimal conditions of the double annealing have been established, after which the critical-current density increased to jc ≥ 104 А/сm2 in an external magnetic field of up to 6 T. The low-temperature treatment in the neutral atmosphere saturated by water vapors deteriorates the current-carrying capacity of the highly textured ceramics, which is connected with the disappearance of texture due to the copper reduction and the precipitation of impurity phases.

About the authors

I. B. Bobylev

Institute of Metal Physics, Ural Branch

Author for correspondence.
Email: bobylev@imp.uran.ru
Russian Federation, ul. S. Kovalevskoi 18, Ekaterinburg, 620990

E. G. Gerasimov

Institute of Metal Physics, Ural Branch; Ural Federal University

Email: bobylev@imp.uran.ru
Russian Federation, ul. S. Kovalevskoi 18, Ekaterinburg, 620990; ul. Mira 19, Ekaterinburg, 620002

N. A. Zyuzeva

Institute of Metal Physics, Ural Branch

Email: bobylev@imp.uran.ru
Russian Federation, ul. S. Kovalevskoi 18, Ekaterinburg, 620990

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