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Grain and grain boundary vortex dynamics in coated conductor by ac susceptibility
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10.1063/1.2783955
/content/aip/journal/jap/102/7/10.1063/1.2783955
http://aip.metastore.ingenta.com/content/aip/journal/jap/102/7/10.1063/1.2783955
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Temperature dependence of the real and the imaginary components of the ac susceptibility, and the values normalized to their Meissner slopes, and for film b with , 0.05, 0.1, 0.5, 1, and at and zero dc applied field.

Image of FIG. 2.
FIG. 2.

Bean length as a function of obtained for film b through the method described in Ref. 12.

Image of FIG. 3.
FIG. 3.

Dependence of the Bean length with the ac field amplitude obtained for film b at different temperatures, , 84, 83, 82, 81, and , from top to bottom. Some of the points which describe the onset of the Bean regime and the crossover to a linear response are indicated (arrows pointing downwards and upwards, respectively).

Image of FIG. 4.
FIG. 4.

component of the ac susceptibility as a function of the ac field, obtained for film b at zero dc applied field at different temperatures, , 86, 85, 84, 82, 80, and , from top to bottom. Arrows indicate some of the points which describe the crossover to a linear response .

Image of FIG. 5.
FIG. 5.

Dynamic phase diagram in the plane determined for film b at zero applied dc-magnetic field and with a frequency of .

Image of FIG. 6.
FIG. 6.

Dynamic phase diagram, vs , determined for the epitaxial thin film, film b (diamond), and for two different coated conductors with different textures, IBAD-a (circles) and IBAD-b (square), with and zero dc applied field. Open symbols correspond to and closed symbols to .

Image of FIG. 7.
FIG. 7.

curves measured for film a at and , and frequencies of 11, 111, 500, and , from left to right.

Image of FIG. 8.
FIG. 8.

Arrhenius plots, vs , obtained at , 0.01, 0.02, 0.05, 0.1, 0.2, 0.5, 0.7, 1.2, and , from left to right. Solid lines are linear fits from which we have determined the activation energy.

Image of FIG. 9.
FIG. 9.

dc-magnetic field dependence of the activation energy determined for film a, at . Lines show theoretical fits, plateau at low fields and power law at high fields.

Image of FIG. 10.
FIG. 10.

Bean length , as a function of , obtained for film a applying the methodology described in Ref. 12.

Image of FIG. 11.
FIG. 11.

Current density dependence of the activation energy determined for film a at and . Lines are power law fits, , with at low current densities and at high current densities.

Image of FIG. 12.
FIG. 12.

Activation energy as a function of , determined for film a at for different dc fields, (●), 0.01 (엯), 0.1 (∎), 0.5 (◻), 1 (◆), 2 (◇), and (▴). Dashed lines are guides for the eyes.

Image of FIG. 13.
FIG. 13.

Activation energy values determined for film a, scaled according to the magnetic field dependence shown in Fig. 9, as a function of , at various dc applied fields, (●), 0.01 (엯), 0.1 (∎), 0.5 (◻), 1 (◆), 2 (◇), and (▴). Dashed line is a guide for the eyes.

Image of FIG. 14.
FIG. 14.

Arrhenius plots, vs , obtained for RABiTS-a at , for dc fields of , 0.005, 0.1, 0.5, 2, and , from left to right. Solid lines are the linear fits from which we have determined the activation energy.

Image of FIG. 15.
FIG. 15.

Field dependences of the activation energies of RABiTS-a (▵) and IBAD-a (●) at . Lines show theoretical fits, plateau at low fields and power law with 0.46 and 0.5 for IBAD-a and RABiTS-a, respectively, at high fields.

Image of FIG. 16.
FIG. 16.

Current dependences of the activation energies obtained for RABiTS-b (open symbols) and film a (closed symbols) at and . Lines are guides for the eyes.

Image of FIG. 17.
FIG. 17.

General magnetic phase diagram of vortex motion regimes identified for YBCO coated conductors. Closed symbols indicate the crossover points determined by the ac-susceptibility analysis and open symbols the points determined by the analysis performed in Ref. 5.

Image of FIG. 18.
FIG. 18.

Temperature dependences of and obtained for film b at and at different applied dc fields , 0.1, 0.5, 1, 2, 5.5, and .

Image of FIG. 19.
FIG. 19.

Irreversibility lines measured for film b (◆), IBAD-a (●), and IBAD-b (∎).

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/content/aip/journal/jap/102/7/10.1063/1.2783955
2007-10-12
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Grain and grain boundary vortex dynamics in YBa2Cu3O7‐δ coated conductor by ac susceptibility
http://aip.metastore.ingenta.com/content/aip/journal/jap/102/7/10.1063/1.2783955
10.1063/1.2783955
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