Columnar tilt and vortex stress in superconducting thin films of NdBa2Cu3O7−δ: Magnetization critical current-density measurements
Columnar tilt and vortex stress in superconducting thin films of NdBa2Cu3O7−δ: Magnetization critical current-density measurements
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NdBa2Cu3O7−δ 超导薄膜中的柱状倾斜和涡旋应力：磁化临界电流密度测量
DOI：
10.1063/1.1812351
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
S. Malik
中科院分区：
文献类型：
--
作者：
S. Khatua;P. Mishra;Ravi Kumar;D. Kundaliya;D. Buddhikot;R. Pinto;S. Malik
在LaAlO 3衬底上制备了C轴取向的NdBa 2Cu 3 O 7-δ薄膜（厚度约为2000），并用Ag+14（200 MeV）离子以不同的c轴倾角（θd=0°，15°，30°和45°）辐照。在高达5 T的外加磁场中，在两种不同温度下，在原始和辐照薄膜上获得了磁化场磁滞回线。根据磁化强度数据对临界电流密度Jc（H，θ）和体积钉扎力Fp（H，θ）的估计揭示了对径迹倾角的强烈依赖性。在等效匹配场B附近，观察到Fp（H，θ）的增加和随后的饱和，而不是通常的高斯峰。我们认为，这种Jc（或Fp）对θd的依赖性是倾斜柱状缺陷对涡旋钉扎的有效修正的结果。
C-axis-oriented NdBa2Cu3O7−δ thin films (thickness ∼2000A) on LaAlO3 substrates have been prepared and irradiated with Ag+14 (200MeV) ions at different inclinations (θd=0°, 15°, 30°, and 45°) to the c axis. Magnetization-field hysteresis loops have been obtained on pristine and irradiated thin films at two different temperatures in applied magnetic fields up to 5T. Estimates of the critical current density Jc(H,θ) and the volume pinning force Fp(H,θ) from the magnetization data reveal a strong dependence on track inclination. An increase and a subsequent saturation in Fp(H,θ), instead of the usual Gaussian peak around the equivalent matching field, Bϕ, is observed. It is suggested that this dependence of Jc (or Fp) on θd is a consequence of the effective modification of vortex pinning by tilted columnar defects.