Characterization of high-T-c superconductors using the higher-harmonic susceptibility

Ozogul Ö., Aydinuraz A.

SUPERCONDUCTOR SCIENCE & TECHNOLOGY, cilt.14, sa.4, ss.184-189, 2001 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 14 Sayı: 4
  • Basım Tarihi: 2001
  • Doi Numarası: 10.1088/0953-2048/14/4/302
  • Dergi Adı: SUPERCONDUCTOR SCIENCE & TECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.184-189
  • Ankara Üniversitesi Adresli: Evet

Özet

In the present work, the harmonic magnetic susceptibilities of the high-T-c superconductors are examined and corresponding harmonic susceptibilities are calculated employing a model by Kim and coworkers. According to Kim's model, the critical-current density, J(c) is a function of the internal magnetic field H-i, J(c)(H) = k/(H-o + \H-i\) where k and H-o are constants. In the model calculations, full penetrations field, H,, is taken to be H-o[(1 + p(2))(1/2) - 1] where p = (2 ka)(1/2)/H-o. AS a result of the comparison of model calculations with experiments, we conclude that the harmonic susceptibilities for lower p values (p < 10) correspond to the similar characteristic magnetic behaviour of granular superconductors, while the harmonic susceptibilities for higher p values correspond to the behaviour of homogeneous superconductors such as single crystal or samples with contiguous oriented grains.