A study of the nonlinearity in magnetic response of Bi2Sr2CaCu2O8

Gencer A., Mutlu R., Belenli I., Ozogul Ö., Aydinuraz A.

SUPERCONDUCTOR SCIENCE & TECHNOLOGY, cilt.9, sa.4, ss.284-289, 1996 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 9 Sayı: 4
  • Basım Tarihi: 1996
  • Doi Numarası: 10.1088/0953-2048/9/4/004
  • Dergi Adı: SUPERCONDUCTOR SCIENCE & TECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.284-289
  • Ankara Üniversitesi Adresli: Evet

Özet

We have carried out low-field ac measurements of harmonic susceptibilities and ac magnetization of a single-phase partially melt-textured Bi2Sr2CaCu2O8 high-temperature superconductor over a wide range of temperatures, field amplitudes and measuring frequencies. Both the fundamental and third-harmonic susceptibility versus temperature and ac magnetization at fixed temperatures close to T-c exhibit strong ac field amplitude and small frequency dependences. In the third-harmonic susceptibility, we observed a double-peak feature in the vicinity of T-c as a function of the applied ac field. This strong field dependence is associated with depinning of vortices at some B and T in different superconducting matrices, which involves different ac loss mechanisms. Experimental results are compared with predictions of some existing theoretical models.