摘要
We measured the longitudinal and transverse Hall resistivities of YBa2Cu3Oy/R1-xMxMnO3 superlattices in magnetic fields to study the transport properties, in which R = La or Nd and M = Ca or Sr. The resistive transition in the magnetic field shows a thermally activated flux flow behaviour. The flux pinning ability of the superlattice is reduced when the coupling strength between YBa2Cu3Oy layers is decreased. The transverse Hall resistivity shows sign reversal for samples with strong pinning ability. The sign reversal diminishes as the pinning force is reduced. The magnetoresistance (MR) ratio, |Δρ(H) - Δρ(H = 0)|/Δρ(H), of the YBa2Cu3Oy/R1-xMxMnO3 superlattice is affected by the coupling strength of R1-xMxMnO3 layers. The peak values of the MR ratio were shifted to lower temperatures in superlattices due to the lowering of the magnetic ordering in ferromagnetic layers.
原文 | 英語 |
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頁(從 - 到) | 1011-1016 |
頁數 | 6 |
期刊 | Superconductor Science and Technology |
卷 | 15 |
發行號 | 7 |
DOIs | |
出版狀態 | 已發佈 - 2002 7月 |
ASJC Scopus subject areas
- 陶瓷和複合材料
- 凝聚態物理學
- 金屬和合金
- 電氣與電子工程
- 材料化學