Abstract
Measurements of the ac susceptibility as a function of temperature and magnetic field were made for “as-prepared” and aged oxidized Cu (Y, Ba) ribbons. It was found that the critical temperature of superconductive transition of “as-prepared” samples is about 330 K. In older samples the temperature dependence of H c1( T) consists of four parts with the well-defined critical temperatures T c= ∼90, ∼150, ∼250 and 330 K.
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