Open AccessOn epitaxial structure and flux pinning of NdBa2Cu3O7-δ/YBa2Cu3O7-δ superconducting multilayers
Author(s) -
Changzhao Chen,
Cai Chuanbing,
Zhiyong Liu,
Ying Li-Liang,
Gao Bo,
Jinlei Liu,
Lu Yuming
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.4371
Subject(s) - superconductivity , materials science , pulsed laser deposition , condensed matter physics , flux pinning , epitaxy , transition temperature , flux (metallurgy) , deposition (geology) , critical current , thin film , nanotechnology , physics , layer (electronics) , metallurgy , paleontology , sediment , biology
By using pulsed-laser deposition technique, a series of multilayers of NdBa2Cu3O7-δ/YBa2Cu3O7-δ, namely with the structures of p×NdBa2Cu3O7-δ(m)/YBa2Cu3O7-δ(n), are prepared on single-crystal SrTiO3, where m and n denotes the number of laser pulses and p is the number of repetetions. XRD patterns indicate that all samples are highly c-axis oriented, and the superconducting transition temperatures of these samples are in the range of 87—91 K, depending on different modulating structures. The larger the modulation period p and consequently the more the interfacial surfaces, the lower the superconducting transition temperature. Magneto-transport measurements reveal that the quasi-multilayers such as NY340×(75/5) (island-like YBa2Cu3O7-δ distributed in NdBa2Cu3O7-δ films) exhibit not only the highest Tc, but also the best magnetic properties. The critical current density of such a quasi-multilayers can be as high as 4×106 A/cm2 under self fields, showing the promising potential application for coated conductors.