Superconducting State Properties of CuBa2Ca3Cu4O10+δ

作者：Artem Lynnyk, R. Puźniak, Luchuan Shi, Jianfa Zhao, Changqing Jin · 发表于：Materials · 年份：2023 · DOI：10.3390/ma16145111 · 被引用次数：8 · 研究领域：Physics of Superconductivity and Magnetism、Magnetic properties of thin films、Magnetic and transport properties of perovskites and related materials

The superconducting state properties of the CuBa2Ca3Cu4O10+δ (Cu-1234) system, with a transition temperature as high as 117.5 K, were investigated. The ac magnetic susceptibility measurements confirmed a very sharp transition to the superconducting state. The upper critical field, Hc2, as high as 91 T, and the irreversibility field, Hirr, as high as 21 T at 77 K, were determined using dc SQUID magnetization measurements. The intragrain critical current density, jc, estimated from a magnetic hysteresis loop, is as high as 5 × 109 A/m2 in a self-generated magnetic field at 77 K. However, the intergrain critical current density in the studied material is smaller by four orders of magnitude due to very weak intergrain connections.