Enhanced critical current density in Ca-doped Y1Ba2Cu4O8
- 11 February 1991
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 58 (6), 651-653
- https://doi.org/10.1063/1.104558
Abstract
The Jc of Ca0.1Y0.9Ba2Cu4O8 (Ca‐1:2:4) synthesized in elevated oxygen pressure is found to be ≳106 A/cm2 at low temperatures and fields, two orders of magnitude greater than the Jc of undoped Y1Ba2Cu4O8 (1:2:4). The Jc (determined by magnetic hysteresis measurements) remains high (5×105 A/cm2) up to B=4 T at 5 K, and is still ≳104 A/cm2 at 40 K and 4 T indicating strong flux pinning. At 77 K, Jc drops to 103 A/cm2 at B=1 T. Ca‐1:2:4 was partially converted to 1:2:3+CuO by brief thermal treatment to generate additional flux pinning centers, but Jc did not improve further.Keywords
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