TITLE

Effect of slow cooling rates on the superconducting characteristics of YBa2Cu3O7-x

AUTHOR(S)
Gopalakrishnan, I. K.; Yakhmi, J. V.; Vaidya, M. A.; Iyer, R. M.
PUB. DATE
October 1987
SOURCE
Applied Physics Letters;10/26/1987, Vol. 51 Issue 17, p1367
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We describe an oxygen annealing procedure to obtain bulk YBa2Cu3O7-x samples with zero electrical resistance states at 105 K, a narrow transition width of ∼1 K, and Jc values in excess of 200 A cm-2 at 77 K. It is suggested that enhanced superconducting characteristics result from incorporating very slow cooling rates (0.1 K/min) during oxygen annealing which possibly maximizes the occupancy of 0, 1/2, 0 oxygen sites and leads to a near-perfect ordering of vacancies at 1/2, 0, 0 sites in the orthorhombic unit cell of YBa2Cu3O7-x.
ACCESSION #
9824678

 

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