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Features of the temperature dependence and magnetic-field dependence of the critical current density close to the critical temperature in thin films
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10.1063/1.3292940
/content/aip/journal/ltp/36/1/10.1063/1.3292940
http://aip.metastore.ingenta.com/content/aip/journal/ltp/36/1/10.1063/1.3292940

Figures

Image of FIG. 1.
FIG. 1.

(a) Determining the critical temperature from the temperature dependence of the imaginary component of the magnetic susceptibility in a variable magnetic field . The straight line is a linear approximation of the high-temperature front of the dependence, and the arrows indicate the following: is the critical temperature, and is the temperature at the maximum . (b) The dependence of the values of (○) and (◻) on the amplitude of the measurement field, . Sample AC86.

Image of FIG. 2.
FIG. 2.

Temperature dependences (as a function of the reduced temperature ) of the measured critical current density (○) at frequencies of (a) and (b and c). The solid lines are approximations of the linear sections. The arrows indicate the ends of the linear sections ( and ) and the intersections of the linear approximations . The dashed line in (c) represents the results of calculations of the critical current density, taking into account the inhomogeneity. Sample PP8.

Image of FIG. 3.
FIG. 3.

Temperature dependences (as a function of the reduced temperature ) of the measured critical current density (○) at frequencies of (a) and (b and c). The solid lines are approximations of the linear sections. The arrows indicate the ends of the linear sections ( and ) and the intersections of the linear approximations . The dashed line in (c) represents the results of calculations of the critical current density, taking into account the inhomogeneity. Sample AC86

Image of FIG. 4.
FIG. 4.

(a) Temperature dependences of the dynamic relaxation rate for samples PP8 (○) and AC86 (◻). The arrows correspond to the ends of the linear sections on the curves of Fig. 3 for the critical current density in sample AC86. (b) The data for sample AC86, shown as a function of . The solid line is an approximation of the experimental data by a dependence of the form .

Image of FIG. 5.
FIG. 5.

Dependences of the measured critical current density on parameters (a) and (b) at , K: 77 (◻), 83.5 (○), 84.5 (△), 85.5 (▽), and 86 (◇) for sample PP8. The values of the critical current density are normalized to the value . The experimental points are connected by curves for visibility.

Image of FIG. 6.
FIG. 6.

Temperature dependences of , determined at the following values of parameter , T: 0.2 (◻), 0.3 (○), and 0.5 (△). The solid curves are the results of calculations of the influence of inhomogeneity. Sample PP8.

Image of FIG. 7.
FIG. 7.

Magnetic-field dependences of the critical current density for sample AC86 at , K: 77.4 (◻), 80 (○), 82 (△), 84 (▽), and 86 (◇). (see Ref. 26, Fig. 6). The solid curve shows the approximation of the experimental data by the dependence obtained using the model proposed in Ref. 17.

Tables

Generic image for table
Table I.

Characteristics of the temperature dependences of the current density in Figs. 2 and 3. are the temperatures at the designated points, and and are the exponents on the linear sections and .

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/content/aip/journal/ltp/36/1/10.1063/1.3292940
2010-03-02
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Features of the temperature dependence and magnetic-field dependence of the critical current density close to the critical temperature in YBa2Cu3O7−δ thin films
http://aip.metastore.ingenta.com/content/aip/journal/ltp/36/1/10.1063/1.3292940
10.1063/1.3292940
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