Effect of columnar defects in YBa[sub 2]Cu[sub 3]O[sub 7-x] ramp-edge Josephson junctions

Kim, D. H.; Kim, D.H.; Lee, C. W.; Lee, C.W.; Lee, T. W.; Lee, T.W.; Hwang, H. G.; Hwang, H.G.; Sung, G. Y.; Sung, G.Y.; Choi, C. H.; Choi, C.H.; Hahn, T. S.; Hahn, T.S.
November 2000
Applied Physics Letters;11/13/2000, Vol. 77 Issue 20
Academic Journal
We investigated the transport properties in YBa[sub 2]Cu[sub 3]O[sub 7-x] (YBCO) ramp-edge Josephson junctions before and after 1.3 GeV Pb-ion irradiation. The barrier of the junctions was formed by structural modification of the ramp-edge surface of the YBCO base electrode. After a dose of ∼2x10[sup 10] Pb ions/cm[sup 2], both critical current and normal resistance of the junctions increased by ∼30% and 10%, respectively, except near the transition temperature. We interpret such an enhancement of the critical current as a result of impeding Josephson vortex motion by pinned magnetic flux in the electrodes. © 2000 American Institute of Physics.


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