||Superconducting properties and microstructures for Ba2SmNbO6 and BaHfO3 co-doped SmBa2Cu3Oy thin films
Kusafuka, Yuma ,
Ichino, Yusuke ,
Tsuchiya, Yuji ,
Ichinose, AtaruYoshida, Yuatka
Superconductor Science and Technology
125008 , 2017-12 , IOP publishing
Recently, we observed that Ba2SmNbO6 (BSNO), which has a double perovskite structure,forms wide nanorods in a SmBa2Cu3Oy (SmBCO) film when compared with BaHfO3 (BHO)nanorods. These wide nanorods can trap flux quanta effectively in low magnetic fields; on theother hand, narrow nanorods can trap flux quanta in high magnetic fields. In this paper, we dopedSmBCO films with BSNO and BHO with the aim of introducing both wide and narrow nanorodsand bringing out the flux pinning properties in low and high magnetic fields simultaneously. Weinvestigated their microstructures and superconducting properties, and as a result, we confirmedthat wide and narrow nanorods could coexist in the SmBCO films. The wide and narrownanorods trapped the flux quanta in different magnetic fields. We also explored the optimalcomposition for BSNO + BHO co-doped SmBCO films. These findings indicate that fluxpinning properties can be tuned by the multiple doping of BMO materials.