• 文献标题:   Graphene doping effects on the magnetic and transport properties of YBa2Cu3O7-d high temperature superconductor
  • 文献类型:   Article
  • 作  者:   FALAHATI S, DADRAS S, MOSQUEIRA J
  • 作者关键词:   ybco high temperature superconductor, activation energy, critical current density, magneto transport, graphene doping, upper critical field
  • 出版物名称:   PHYSICA BCONDENSED MATTER
  • ISSN:   0921-4526 EI 1873-2135
  • 通讯作者地址:  
  • 被引频次:   0
  • DOI:   10.1016/j.physb.2022.414192 EA JUL 2022
  • 出版年:   2022

▎ 摘  要

In this work, bulk graphene-doped YBa2Cu3O7-delta(YBCO) high-temperature superconductor samples were pre-pared with composition of YBCO + x wt.% graphene nanoplatelets (G) (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0). The X-ray diffraction patterns show the YBCO orthorhombic phase in all the samples. The SEM images show good grain connectivity between YBCO grains in graphene-doped samples. Furthermore, the broadening of resistivity under applied magnetic fields up to 9T and thermally activated flux creep in the mixed state were studied using Arrhenius plots. The activation energy U0 (H) increased with graphene doping results in better flux pinning and higher critical current densities. Moreover, improvement in the critical temperature (TC), upper critical field (mu 0HC2) and the irreversibility field (mu 0Hirr) were observed in graphene-doped samples as compared to the pure YBCO sample.