ISSN:
1572-9605
Keywords:
(YBa2Cu3O7−δ )1−x Ag x
;
percolation
;
thick films
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract We present the percolation and electronic properties of (Y1Ba2Cu3O7−δ )1−xAgx compounds in which silver fills the intergranular space without reducing Tc, which remains at 92 ± 1 K. Normal-state resistivity is decreased by up to two orders of magnitude when adding up to 50 wt.% Ag (T c=87 K), and samples exhibit improved contact resistance, better mechanical properties, and resistance to water. We analyzed the percolation properties of these compounds and found that the critical indicest, s are in agreement with percolation theory, butp c is higher than expected, probably due to the effect of holes. TheJ c estimated from magnetization reaches 5 · 104A/cm2 (atT = 4.2K,H = 0) and shows enhancement of 15–50% by addition of ∼ 10 wt.% Ag, which exists also in samples having a higherJ c due to preparation conditions (temperature). We present preliminary results on the 2D percolation problem in (Y1Ba2Cu3O[7−δ )1−xAgx samples, obtained by preparing Y1Ba2Cu3O7−δ thick films using the spin-on technique. Preliminary results show good adhesion but a reduced Tc of Y1Ba2Cu3O7−δ films compared with bulk samples.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00618528
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