Title :
Superconductivity and flux pinning in Nd/sub 1+x/Ba/sub 2-x/Cu/sub 3/O/sub 7+ delta /
Author :
Yoo, S.I. ; Kramer, M.J. ; McCallum, R.W.
Author_Institution :
Ames Lab., Iowa State Univ., IA, USA
fDate :
3/1/1993 12:00:00 AM
Abstract :
The substitution of Nd/sup +3/ for Ba/sup +2/ in Nd/sub 1+x/Ba/sub 2-x/Cu/sub 3/O/sub 7/ (Nd123ss) increases the occupation of O(5) sites. For x>0.1 there is a significant depression of T/sub c/, and for x<0.1 there is no substantial decrease in T/sub c/ within experimental error. T/sub c/ vs. x is characterized by two plateaus, analogously to T/sub c/ vs. delta in YBa/sub 2/Cu/sub 3/O/sub 7- delta / (Y123). Analysis of oxygen contents of Nd123ss suggests the analogy with Y123 is valid. The transition width and Meissner fraction for all Nd123ss samples are strongly dependent on the sintering temperatures. While T/sub c/ is not affected over the range 0>
Keywords :
Meissner effect; barium compounds; flux creep; flux pinning; high-temperature superconductors; magnetic hysteresis; neodymium compounds; sintering; superconducting transition temperature; Meissner fraction; Nd/sub 1+x/Ba/sub 2-x/Cu/sub 3/O/sub 7/; Nd/sup 3+/ substitution; flux creep; flux pinning; high temperature superconductors; hysteresis; sintering temperatures; superconducting order parameter; transition width; Atomic measurements; Energy measurement; Flux pinning; Magnetic flux; Magnetic hysteresis; Neodymium; Superconducting magnets; Superconducting transition temperature; Superconductivity; Temperature dependence;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
