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Publication
Physica C: Superconductivity and its applications
Paper
Relaxation of the magnetization in high-Tc superconductors
Abstract
Logarithmic time decays of the magnetization M have been observed in SrLaCuO and BaLaCuO specimens. If a small field Hi < HC1 is applied to a virgin specimen, the isothermal dc magnetization M is unstable and decays in time following the law M-M0 α THin1n( t t0) with n {reversed tilde equals} 3 over an observation period of 105 sec. If the field Hi is removed, the same law is followed at H = 0 with a logarithmic rate ∂M ∂lnt about a factor of three smaller. This indicates that these substances have a strong "memory" of the field Hi applied previously. © 1988.