Abstract
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> A detailed study on <formula formulatype="inline"><tex Notation="TeX">${\rm YBa}_{2}{\rm Cu}_{3}{\rm O}_{7-\delta}$</tex></formula> (YBCO) films with <formula formulatype="inline"><tex Notation="TeX">${\rm BaZrO}_{3}$</tex></formula> (BZO) inclusions (YBCO-BZO) deposited on <formula formulatype="inline"><tex Notation="TeX">${\rm SrTiO}_{3}$</tex></formula> substrate with different BZO contents is presented. X ray diffraction, SEM imaging and superconductive critical temperature <formula formulatype="inline"><tex Notation="TeX">$(T_{c})$</tex></formula> measurements were performed to evaluate film growth quality. Independently from the BZO content, all YBCO-BZO films showed <formula formulatype="inline"><tex Notation="TeX">$T_{c}$</tex> </formula> values close to that of pure YBCO indicating that the <formula formulatype="inline"><tex Notation="TeX">$T_{c}$</tex></formula> reduction which is usually observed on YBCO-BZO films can be successfully recovered by changing the deposition conditions. All YBCO-BZO films showed an improved critical current density <formula formulatype="inline"><tex Notation="TeX">$(J_{c})$</tex> </formula> dependence on magnetic field if compared to the typical <formula formulatype="inline"><tex Notation="TeX">$J_{c}(H)$</tex></formula> of YBCO, resulting in higher irreversibility fields up to 9 T at 77 K. SEM observation on etched samples suggests a direct link between the defect density measured in YBCO-BZO samples and that calculated from the observed in field performances. The analysis of <formula formulatype="inline"><tex Notation="TeX">$J_{c}(B)$</tex> </formula> as a function of applied magnetic field direction revealed that the pinning due to isotropic pinning centers typical for YBCO is coupled with a <formula formulatype="inline"><tex Notation="TeX">$c$</tex></formula>-axis correlated pinning in YBCO-BZO which can be ascribed to BZO induced columnar defects. <formula formulatype="inline"><tex Notation="TeX">$J_{c}(B)$</tex> </formula> recorded at several temperatures down to 10 K revealed matching effect features. </para>
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