Title :
Excellent Critical Current Properties of Dilute Sr-Doped Dy123 Melt-Solidified Bulks at Low Temperatures
Author :
Ishii, Yui ; Yamazaki, Yuhya ; Akasaka, Tomoyuki ; Ogino, Hiraku ; Horii, Shigeru ; Shimoyama, Jun-ichi ; Kishio, Kohji
Author_Institution :
Dept. of Appl. Chem., Univ. of Tokyo, Tokyo, Japan
fDate :
6/1/2009 12:00:00 AM
Abstract :
We have previously reported that dilute impurity doping technique universally enhances the critical current density of RE123 superconductors. These doping effects on the J c properties depend on substituted cation sites. In this paper, we report the flux pinning properties of the dilute Sr- or Co-doped Dy123 melt-solidified bulks in a wide temperature range. It was found that the dilute Sr-doping effectively enhance the J c for Dy123 melt-solidified bulks with low level Dy/Ba substitution. For the dilute Sr-doped Dy123 samples, the temperature coefficient of J c in 30 kOe was found to be approximately two times larger than for undoped materials above 40 K, meaning that it is an effective method for developing high-J c RE123 materials operating at low temperatures.
Keywords :
barium compounds; cobalt; critical current density (superconductivity); doping; dysprosium compounds; flux pinning; high-temperature superconductors; strontium; Dy(Ba1-xSrx)2Cu3Oy; Dy123 melt-solidified bulks; DyBa2Cu3-xCoxOy; RE123 superconductors; critical current density; dilute impurity doping technique; flux pinning; temperature coefficient; ${rm REBa}_{2}{rm Cu}_{3}{rm O}y$ ; Critical current property; flux pinning; impurity doping;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2009.2019014
