Microstructure and superconductivity of Ir-doped BaFe2As2 superconductor

Wang, X. L.; Shi, H. Y.; Yan, X. W.; Yuan, Y. C.; Lu, Z.-Y.; Wang, X. Q.; Zhao, T.-S.
January 2010
Applied Physics Letters;1/4/2010, Vol. 96 Issue 1, p012507
Academic Journal
Polycrystalline samples with nominal composition of Ba(Fe1-xIrx)2As2 (x=0.10, 0.15, and 0.20) were investigated by means of x-ray diffraction (XRD), scanning electron microscopy (SEM), electrical resistivity, and magnetization measurements. XRD and SEM results showed that almost single phase samples were obtained. Bulk superconductivity with TC∼28 K was observed in the x=0.10 sample. TC∼28 K is the highest superconducting critical temperature among the reported data for electron-doped AFe2As2-type (A=Ca, Sr, and Ba) superconductors. The upper critical field Hc2(0) reaches as high as 65 T for the x=0.10 sample. The underlying physics is discussed in connection with Co-doping case.


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