This article is cited in 15 papers

Superconductivity

Effect of low-temperature treatment and subsequent high-temperature annealing on the critical current density of YBa$_2$Cu$_3$O$_y$

I. B. Bobylev, N. A. Zyuzeva

Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg

Abstract: The field dependences of the critical current density of the HTSC compound YBa$_2$Cu$_3$O$_y$ recovered at $T$ = 920–950$^\circ$C after the low-temperature treatment have been investigated. At $T$ = 200$^\circ$C, structural defects are formed in a wet environment, which are capable of initiating pinning of magnetic vortices. A short-term (1–3 h) recovery annealing performed at $T$ = 930–950$^\circ$C leaves in the samples a fairly large amount of structural defects formed during the low-temperature treatment, which results in a substantial increase in the critical current density in magnetic fields of $\sim$2 T as compared to the ceramics not subjected to double annealing. A longer high-temperature treatment removes the structural defects formed and brings the electrophysical properties of YBa$_2$Cu$_3$O$_y$ to the level characteristic of the ceramics produced by standard technology.

Received: 27.12.2011

 English version: Physics of the Solid State, 2012, 54:7, 1332–1335

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