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Vortex Behaviors Near Irreversibility Fields of a -Axis Oriented Y123 Films Inserted Pr123 Layers

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10 Author(s)
Takamura, M. ; Kyushu Univ., Fukuoka, Japan ; Mukaida, M. ; Horii, S. ; Ichinose, A.
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The irreversibility temperatures were measured for a-axis oriented and c-axis in-plane aligned Y123/Pr123 multilayer films in various magnetic fields. Pr123 layers act as two-dimensional (planer) c-axis correlated artificial pinning centers (APCs) in the multilayer films. In the irreversibility field-temperature (B irr - T) curves, the crossover was observed near matching field B phi for the multilayer films, when the magnetic fields were applied parallel to the c -axis of the film (B//c). It is suggested the vortex state in Y123 films with two-dimensional APCs is Bose glass below the crossover field. The B irr - T curves under B // a shifted toward lower temperature and magnetic field regions.

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Applied Superconductivity, IEEE Transactions on  (Volume:19 ,  Issue: 3 )