Abstract
We briefly report the variation of resistivity and the extraordinary magnetic behavior of the samples Ba0.2La0.8Fe2As2 and Pt-doped Ba0.2La0.8Fe2−xPt x As2 (x = 0, 0.05, 0.1, and 0.15) prepared by a solid-state reaction method. All samples crystallize with the ThCr2Si2-type structure. We have investigated in detail the superconducting state with magnetization measurements in the temperature range 5–170 K, up to a field of 20 Oe. Substitution of Pt for Fe element produced induced the superconductivity. The results of direct substitution of non-isoelectronic Pt for Fe were also studied for similar compositions at different dopant rates (Kamihara et al., J. Am. Chem. Soc., 130, 3296–3297, 2008). Based on magnetization measurement data, we observed the variation of superconducting critical temperature (T c) by increasing the Pt dopant from x = 0 to x = 0.1. The dopant rate of x = 0.15 is the limit point of decreasing superconductivity because of lattice shrinking, attributed to the change of T c. This should be an indication of geometric factor (pressure effect) by Pt substitution for Fe atoms (Li et al. 2008).
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