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(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 .
(Color online) Magnetic field dependence of the critical current density at different temperatures for the three samples.
(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.
(Color online) Upper critical field—temperature phase diagram of LaFeAsO1− x F x .
(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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