Abstract
Magnetic hysteresis M( H) and magnetic relaxation M( t) results on Pr-doped single-crystal Bi 2Sr 2Ca 0.89-Pr 0.11Cu 2O 8+ δ with optimum T c=88 K are reported. Superconducting H– T phase diagram with applied field parallel to single-crystal c-axis indicates that in the mixed state the anomalous second peak field and its onset field H 2p/ H on varies from 900/800 G at 15 K to 210/85 G at 40 K with a plateau around 20–30 K. Low-field magnetic relaxation M( t) data near H 2p/ H on indicates a distinct change of flux creep behavior. For H< H on, the relaxation mechanism follows the collective creep model M( t)= M 0[1+( μk B T/ U 0)ln( t/ t 0)] −1/ μ and crosses to the vortex glass model M( t)= M 0( t/ t 0) 1/[1−( Uo/ k B T)] when H> H on. Such a crossover behavior implies a change in vortex coupling mechanism from vortex quasi-lattice to entangled vortex glass.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
