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YBa2Cu3O7-δ(YBCO) films with a thickness of up to 2 μm containing nano-sized BaHfO3(BHO) have been grown on biaxially textured metal tapes by pulsed laser deposition. Transmission electron microscopy revealed the inclusion of Y2O3platelets and rod-like BHO structures. A c-axis oriented growth of the YBCO layer and biaxial oriented incorporation of BHO is confirmed by X-Ray diffraction. BHO expands the c-axis of YBCO, flattens the surface of YBCO and densifies the films. Y2O3inclusions get smaller and finer distributed, possibly with a positive influence on pinning effects. A superconducting transition temperature Tcof about 89 K was determined, decreasing slightly with increasing BHO content. Transport current measurements in the maximum Lorentz force configuration showed an increased irreversibility field Hirrand higher pinning force density Fpwith increasing BHO content in high magnetic fields.
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Sieger et al. (2014) studied this question.
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