The resistivity of YBa 2 Cu 3 O 7−δ (YBCO) films deposited by a pulsed laser from nanograined targets doped with various amounts of BaZrO 3 (BZO) is investigated in the thermally activated flux-flow (TAFF) regime, where the activation energy, U , has a linear temperature dependence. It is found that the magnetic field dependence of the irreversibility temperature, T irr ( B ), has a maximum at some optimal BZO concentration, which depends on the applied magnetic field. Our results show that the superconducting materials used in different magnetic fields need optimization of the dopant concentration to achieve the best properties for various applications.
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Сафончик et al. (2009) studied this question.
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