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Upper critical field and thermally activated flux flow in LaFeAsO1− x F x
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Observed (symbols) and calculated (solid line) XRD patterns of LaFeAsO1− x F x (x = 0.05) with the bottom trace showing the difference. The blue lines indicate the peak positions from the La1111 phase. The inset shows the crystal structure of the LaFeAsO1− x F x .

Image of FIG. 2.
FIG. 2.

(Color online) Magnetic field dependence of the critical current density at different temperatures for the three samples.

Image of FIG. 3.
FIG. 3.

(Color online) The temperature dependence of the resistance of LaFeAsO1− x F x samples at different magnetic field. The inset shows the temperature dependence of resistance for LaFeAsO1− x F x at zero magnetic fields.

Image of FIG. 4.
FIG. 4.

(Color online) Upper critical field—temperature phase diagram of LaFeAsO1− x F x .

Image of FIG. 5.
FIG. 5.

(Color online) (a) Arrhenius plot of the electrical resistance of LaFeAsO0.95F0.05. U o is given by the slope from a linear fitting. (b) Magnetic field dependence of U o for LaFeAsO1 − x F x (x = 0.05, 0.15, 0.20).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Upper critical field and thermally activated flux flow in LaFeAsO1−xFx