The collective flux pinning force in (Sm0.5Eu0.5)Ba2Cu3O7−δ superconductors
The collective flux pinning force in (Sm0.5Eu0.5)Ba2Cu3O7−δ superconductors
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(Sm0.5Eu0.5)Ba2Cu3O7−δ 超导体中的集体磁通钉扎力
DOI：
10.1088/0953-2048/19/8/024
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发表时间：
2006
影响因子：
3.6
通讯作者：
J. Gao
中科院分区：
文献类型：
--
作者：
P. Li;Z. Wang;A. Hu;Z. Bai;L. Qiu;J. Gao
我们用振动样品磁强计测量了顶部籽晶熔体加工的（Sm0.5Eu0.5）Ba 2Cu 3 O 7 −δ+10 mol%（SmEu）BaCuO 5 +10 wt% Ag晶体在平行于c轴的8 T磁场中从50到87 K的等温磁化曲线。所有的等温Jc（H）曲线都显示出第二个峰。Fp-H曲线的标度表明，磁通钉扎力Fp来自两种钉扎中心的集体钉扎，Fp = FpH+FpL。一个（FpH）是由RE-Ba和RE-RE取代产生的Δ Tc型钉扎中心，负责第二个峰;另一个（FpL）是由表面钉扎和点钉扎贡献的法向钉扎中心。Hc 2-T图暗示了两个临界温度。在88.2K左右发生了交叉。
We have measured the isothermal magnetization loops of top-seeded melt processed (Sm0.5Eu0.5)Ba2Cu3O7−δ+10 mol% (SmEu)BaCuO5+10 wt% Ag crystals in a magnetic field up to 8 T parallel to the c-axis from 50 to 87 K using a vibrating sample magnetometer. All of the isothermal Jc(H) curves show a second peak. The scaling of the Fp–H curves indicates that the flux pinning force Fp comes from the collective pinning of two kinds of pinning centres, Fp = FpH+FpL. One (FpH) is the ΔTc-type pinning centre originating from the RE–Ba and RE–RE substitution responsible for the second peak; the other (FpL) is the normal pinning contributed by the surface and point pins. The Hc2–T diagram implies two critical temperatures. The crossover occurs at about 88.2 K.