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Flux pinning and vortex transitions in doped BaFe2As2 single crystals
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Determination of the glass transition temperature from the Vogel-Fulcher relation for BaK-122 at three different magnetic fields.

Image of FIG. 2.
FIG. 2.

(Color online) Resistivity scaling according to Eq. (5) for (a) BaK-122, (b) BaCo-122, and (c) BaNi-122single crystal for 0 ≤ B ≤ 13 T. Inset: Arrhenius plot of the resistance.

Image of FIG. 3.
FIG. 3.

(Color online) Phase diagrams of BaK-122 (squares), BaCo-122 (stars), and BaNi-122 (circles) single crystals. B g was obtained from the experimental ρ(T) and U0(T) data (see Figs. 2 and 4). Bc2(T) values were obtained from the criterion of the 90% values of their corresponding resistivity transition. Open symbols: Bc2 and solid symbols: Bg. Inset: general phase diagram.

Image of FIG. 4.
FIG. 4.

(Color online) The pinning potential U0(B,T) as calculated according to Eq. (6) in field of 0 ≤ H ≤ 13 T for (a) BaK-122, (b) BaCo-122, and (c) BaNi-122 single crystal.

Image of FIG. 5.
FIG. 5.

(Color online) Magnetic field dependence of UB/kB as estimated from Eq. (3) and the slopes in Fig. 4. The solid lines are a fit to the data giving the relation UB/kB ≈ B−n with n = 0.06 at B < 3 T and n = 0.9 at B > 3 T. Inset: Field dependence of the estimated activation energy based on the TAFF model.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Flux pinning and vortex transitions in doped BaFe2As2 single crystals