Critical current of HoBa₂Cu₃O_y tape fabricated by inclined substrate deposition

HoBa₂Cu₃O_y (HoBCO) films on the bi-axially textured buffer layer prepared by Inclined Substrate Deposition method are studied. The HoBCO and buffer layers are supported by Ni-based-alloy substrate to form superconducting tape. Critical current density (J_c) of this tape exceeds about 1 × 10⁹ A/m² at 77 K in the self-field. To investigate practical performance of this tape, various dependences of J_c, such as the magnetic-field dependence is measured. For the measurement of J_c in the magnetic field, its dependence of the angle of the field and the tape's plane is taken into account. The result shows that J_c has a notable peak when the magnetic field is perpendicular to the angle of the field to the tape's plane. The J_c peak gradually diminishes as the field increases. Similar magnetic field dependence of J_c is observed in a YBa₂Cu₃O_y (YBCO) sample. This study confirms that data of the perpendicular and parallel field dependence of J_c, as such, are not sufficient for evaluation of practical performance of HoBCO tape.