Dynamics of trapped magnetic fluxes in single-crystal YBCO in weak fields
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(a) Normalized isothermal magnetization relaxation rate of single-crystal YBCO with unidirectional twinning boundaries at temperatures close to the critical value . The inset shows the characteristic dependences on a semilog scale for some temperatures. (b) Typical dependences. The dashed lines were used to estimate the relaxation rates on the quasi-logarithmic sections of . The region of strong thermally activated fluctuations is shown by the double-headed arrow.
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(a) Magnetization relaxation caused by the local magnetic flux of a microsolenoid captured in the FC regime , at two close-to-critical temperatures (◼ and △). The results obtained in strong fields [R. Prozorov et al., 1995)], taken from Ref. 4 (○) are shown for comparison. The inset shows the experimental layout (TB indicates twin boundaries). (b) Effective thermal-activation energy of the creep of low-density magnetic flux in the temperature range of interest, estimated from the Anderson-Kim model (◼). The inset shows the region with unidirectional twinning boundaries, their orientation (TB), and the relationship of the geometrical dimensions of the test crystal and the cross section of the microsolenoid.
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