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- W1639856871 startingPage "14609" @default.
- W1639856871 abstract "The remanent magnetic flux creep in ${mathrm{YBa}}_{2}{mathrm{Cu}}_{3}{mathrm{O}}_{7ensuremath{-}mathrm{ensuremath{delta}}mathrm{}}$ thin films was investigated in the vicinity of the critical temperature ${T}_{c}.$ The trapped magnetic flux was generated in the specimen by ramping the applied field to a finite value and then back to zero. The remanent magnetic field of persistent currents circulating in the sample was measured as a function of temperature and time. Data on the critical current density ${j}_{c}$ and the creep activation energy U were extracted. A sharp decrease of U at temperatures ${T}_{c}ensuremath{-}Tensuremath{lesssim}1 mathrm{K}$ was related to critical fluctuations. In this critical region a power-law time decay of the currents $jensuremath{propto}{t}^{ensuremath{-}p}$ was observed and explained by the logarithmic dependence ${U=U}_{0}mathrm{ln}{(j}_{c}/j)$ for the current-assisted thermal unbinding of vortex-antivortex pairs generated by the critical fluctuations. In the critical region, the temperature dependence ${j}_{c}ensuremath{propto}{(T}_{c}ensuremath{-}{T)}^{2}$ was observed. A possibility to relate this result to the critical behavior of the three-dimensional $mathrm{XY}$ model is discussed." @default.
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- W1639856871 date "1998-12-01" @default.
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- W1639856871 title "Remanent flux creep in<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: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:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>O</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn><mml:mi …" @default.
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- W1639856871 doi "https://doi.org/10.1103/physrevb.58.14609" @default.
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