Tilted BaHfO₃nanorod artificial pinning centres in REBCO films on inclined substrate deposited-MgO coated conductor templates

Abstract

We grow BaHfO 3 (BHO) nanorods in REBa 2 Cu 3 O 7−x (REBCO, RE: Gd or Y) thin films on metal tapes coated with the inclined substrate deposited (ISD)-MgO template by both electron beam physical vapour deposition and pulsed laser deposition. In both cases the nanorods are inclined by an angle of 21°-29°with respect to the sample surface normal as a consequence of the tilted growth of the REBCO film resulting from the ISD-MgO layer. We present angular critical current density (J c ) anisotropy as well as fieldand temperature-dependant J c data of the BHO nanorod-containing GdBCO films demonstrating an increase in J c over a wide range of temperatures between 30 and 77 K and magnetic fields up to 8 T. In addition, we show that the angle of the peak in the J c anisotropy curve resulting from the nanorods is dependent both on temperature and magnetic field. The largest J c enhancement from the addition of the nanorods was found to occur at 30 K, 3 T, resulting in a J c of 3.0 MA cm −2 .

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