Anisotropy and Lorentz-Force Dependences of Critical Current Density in $C$-Axis-Oriented YBa2Cu3O7-δ Thin Film

概要

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The magnetic field angular dependence of $J_{\text{c}}(\theta)$ for a $c$-axis-oriented YBa2Cu3O7-δ (YBCO) thin film was measured using both constant and variable Lorentz force configurations. When the field was tilted from the $c$-axis within ${\pm}30$°, $J_{\text{c}}(\theta)$ was independent of the intensity of the Lorentz force. This demonstrates that the vortices have bent segments trapped by pinning centers that extend parallel to the $c$-axis, and $J_{\text{c}}(\theta)$ is limited by the depinning of these segments. The effect on $J_{\text{c}}(\theta)$ of the two types of pinning centers, i.e., either parallel to the $c$-axis or to the $ab$ plane, should be considered when the field is tilted from the $ab$ plane within ${\pm}30$°.
INSTITUTE OF PURE AND APPLIED PHYSICSの論文
2005-01-10