Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 36: Superconductivity - Vortex Dynamics, Vortex Phases, Pinning

TT 36.6: Vortrag

Mittwoch, 9. März 2005, 11:15–11:30, TU H2053

Artificial modulation and anisotropy of flux pinning force in R123 composite films — •Chuanbing Cai, Jens Haenisch, Thomas Gemming, and Bernhard Holzapfel — IFW Dresden, D-01171 Dresden, Germany

Artificial flux pinning centers in R123 films has emerged much significant for both fundamental understanding and practical applications (especially for coated conductors). Using PLD technique, we prepared two types of composite films: i) superlattices consisting of three R123: n×(Gd123_d/Nd123_d/Eu123_d), and ii) multilayer of R123/Y₂O₃: n×(Y123_d1/YO_d2). They possess the potential of artificial flux pinning centers due to expitaxial strain fields and second phase additions, respectively. We show the tailorable flux pinning forces and their anisotropy by angular dependences of the transport critical current density. It is revealed that the strongest modulation of flux pinning takes place at field direction parallel to c while it is hardly variable at field direction perpendicular to c.