Abstract
We investigated the effect of the BaHfO 3 (BHO) nanorods' configuration on transport properties at artificial grain boundaries (GBs) in SmBa 2 Cu 3 O y (SmBCO) superconducting films. To control the nanorods' configuration at the GBs, we deposited 3.0 vol.% BHO-doped SmBCO films on 5° [001]-tilt bicrystal (LaAlO 3 ) 0.3 (SrAl 0.5 Ta 0.5 O 3 ) 0.7 substrates at relatively low growth temperature of 750 °C via the pulsed laser deposition method adopting a seed layer technique. According to the transport results, the critical current density (J c ) at the GBs was improved in the films with the nanorods at low magnetic fields. In addition, field angular dependence of Jc was also improved for a wide range of field directions with a broad peak for B//c. We estimated that the BHO nanorods in the GBs pinned the Abrikosov-Josephson (AJ) vortices with various directions in the GBs. AJ vortex pinning can be controlled by configuration of a pinning center at GB.
Published Version
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