Malmivirta Mika, Rijckaert Hannes, Paasonen Ville, Huhtinen Hannu, Hynninen Teemu, Jha Rajveer, Awana Veerpal Singh, Van Driessche Isabel, Paturi Petriina
Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014, Turku, Finland.
University of Turku Graduate School (UTUGS), University of Turku, FI-20014, Turku, Finland.
Sci Rep. 2017 Oct 31;7(1):14682. doi: 10.1038/s41598-017-13758-6.
The flux pinning properties of the high temperature superconductor YBaCuO (YBCO) have been conventionally improved by creating both columnar and dot-like pinning centres into the YBCO matrix. To study the effects of differently doped multilayer structures on pinning, several samples consisting of a multiple number of individually BaZrO (BZO) and BaCeO (BCO) doped YBCO layers were fabricated. In the YBCO matrix, BZO forms columnar and BCO dot-like defects. The multilayer structure improves pinning capability throughout the whole angular range, giving rise to a high critical current density, J . However, the BZO doped monolayer reference still has the most isotropic J . Even though BZO forms nanorods, in this work the samples with multiple thin layers do not exhibit a c axis peak in the angular dependence of J . The angular dependencies and the approximately correct magnitude of J were also verified using a molecular dynamics simulation.
高温超导体钇钡铜氧化物（YBCO）的磁通钉扎特性传统上是通过在YBCO基体中同时形成柱状和点状钉扎中心来改善的。为了研究不同掺杂多层结构对钉扎的影响，制备了几个由多个单独掺杂了BaZrO（BZO）和BaCeO（BCO）的YBCO层组成的样品。在YBCO基体中，BZO形成柱状缺陷，BCO形成点状缺陷。多层结构在整个角度范围内提高了钉扎能力，产生了高临界电流密度J。然而，掺杂BZO的单层参考样品仍具有最各向同性的J。尽管BZO形成了纳米棒，但在这项工作中，具有多个薄层的样品在J的角度依赖性中并未表现出c轴峰值。J的角度依赖性和大致正确的大小也通过分子动力学模拟得到了验证。
