A Universal Relation for Magnitization Curves in High-Tc Superconducting Films

Tsutomu Nojima, Toshizo Fujita

Research output: Contribution to journalArticlepeer-review


We made magnetization measurements on superconducting YBCO and BSCCO films with high c-axis orientation and found a universal dependence of normalized magnetization hysteresis ΔM/ΔM0 on normalized magnetic field H/H0 along the c-axis, where ΔM0 is the magnitude of hysteresis ΔM at H=0 and Hø is the “irreversibility field.” This relation between ΔM/ΔM0 and H/H0 is excellently fitted by a single curve irrespective of temperatures and materials investigated. Except for H−H0, ΔM/ΔM0 decreases exponetially with H/H0, while in the vicinity of H0 the data deviates from the exponential dependence. On the basis of the flux creep model, we succeeded in interpreting the universality by employing a logarithmic dependence of the effective pinning potential on current J at high density, which was recently proposed by Zeldov et al., and a linear J dependence at low density formerly proposed by Anderson and Kim.

Original languageEnglish
Pages (from-to)191-194
Number of pages4
Journaljournal of the japan society of powder and powder metallurgy
Issue number2
Publication statusPublished - 1991
Externally publishedYes

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry


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