AC susceptibility hysteresis in granular superconductors

✍ Scribed by S.K. Hasanain; Shaista Shahzada; A. Mumtaz; G.S. Bhatti

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 610 KB
• Volume: 269
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(96)00444-3

✦ Synopsis

We have investigated the hysteresis in the AC susceptibility of granular YBCO superconductors when the DC field is cycled. A crossover point is observed where the susceptibility X' in decreasing fields becomes more diamagnetic than for increasing fields, and this is investigated as a function of temperature, AC field amplitude and frequency. The behavior is consistent with the variation of the AC penetration depth with these variables and with a reduced flux density of the intergrain regions on field reversal. The zero field cooled behavior of the second harmonic X2 as well as the behavior of X' in field cooled conditions, are also reported. The DC field dependence of X' is analyzed using the low amplitude, linear response region approximations.