Enhanced critical current density in Ca-doped Y1Ba2Cu4O8

Narwankar, P. K. ; Chandrachood, M. R. ; Morris, D. E. ; Sinha, A. P. B. (1991) Enhanced critical current density in Ca-doped Y1Ba2Cu4O8 Applied Physics Letters, 58 (6). 651_1-651_3. ISSN 0003-6951

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Official URL: http://apl.aip.org/resource/1/applab/v58/i6/p651_s...

Related URL: http://dx.doi.org/10.1063/1.104558


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.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
Keywords:Yttrium Oxides; Barium Oxides; Copper Oxides; Critical Current; Superconductivity; Magnetic Flux; Hysteresis; X-ray Diffraction; Calcium Additions
ID Code:48974
Deposited On:18 Jul 2011 10:21
Last Modified:18 Jul 2011 10:21

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