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- W2060756119 abstract "We have measured the magnetic-field and temperature dependence of the surface resistance ${mathit{R}}_{mathit{s}}$ of grain-aligned ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{mathit{x}}$. Experiments were conducted on ab-plane- and ac-plane-oriented samples, with the dc magnetic field parallel and perpendicular to the sample surface. We explain the nonlinear behavior of ${mathit{R}}_{mathit{s}}$ at low field using a model with an array of Josephson weak links and the linear dependence on magnetic field at high field using an oscillatory-vortex-motion-loss model. The model allows a quantitative fit to the experimental data using the lower critical field of the grain, the entry field ${mathit{H}}_{mathit{c}1mathit{J}}$ of weak links, the junction decoupling parameter ${mathit{H}}_{mathit{d}}$, and the vortex viscosity as fitting parameters. Two different sets of parameters ${mathit{H}}_{mathit{d}}$ and ${mathit{H}}_{mathit{c}1mathit{J}}$ were used to fit the data, suggesting that in grain-aligned ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{mathit{x}}$ bulk material at least two kinds of weak link are responsible for low-field losses. An estimation of the Josephson-junction area was obtained from field-modulated microwave absorption. In addition, thermal-excitation and radiation-activation mechanisms for rf losses are compared." @default.
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- W2060756119 title "Surface resistance of grain-aligned<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math…" @default.
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- W2060756119 doi "https://doi.org/10.1103/physrevb.47.8968" @default.
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