Figure 2: Critical current density and irreversibility field of irradiated SmFeAsO0.8F0.15. | Nature Communications

Figure 2: Critical current density and irreversibility field of irradiated SmFeAsO0.8F0.15.

From: Huge critical current density and tailored superconducting anisotropy in SmFeAsO0.8F0.15 by low-density columnar-defect incorporation

Figure 2

(a) Micro-Hall-bar voltage signal from the middle sensor for sample no. 2 before and after irradiation to a dose-matching field of BΦ=9.5 T. (b) Magnetic field dependence of Jc at various temperatures for sample no. 2. The magenta solid line is the Jc determined from SQUID measurements at T=5 K using the Bean model calculation. The open symbols are Jc obtained from the micro-Hall-array magnetometer. (c) Jc as a function of temperature for the pre-irradiated sample no. 1, postirradiated sample no. 1 (BΦ=4 T) and sample no. 2 (BΦ=9.5 T). 10% Jc uncertainty of postirradiated sample no. 1 arises from the different determinations between measurements of Hall array and magneto-optical imaging. (d) The irreversibility line for the investigated three samples. Jc=2,000 A cm−2 was used as a criterion to determine the irreversibility fields. Uncertainty comes from the noise in Jc measurement which is shown in b. The solid lines in c and d are guides to the eye.

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