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arXiv · 0902.3957

Superconductivity at 22.3 K in SrFe2-xIrxAs2

Fei Han·Xiyu Zhu·Ying Jia·Lei Fang·Peng Cheng·Huiqian Luo·Bing Shen·Hai-Hu Wen
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Abstract

By substituting the Fe with the 5d-transition metal Ir in SrFe2As2, we have successfully synthesized the superconductor SrFe2-xIrxAs2 with Tc = 22.3 K at x = 0.5. X-ray diffraction indicates that the material has formed the ThCr2Si2-type structure with a space group I4/mmm. The temperature dependence of resistivity and dc magnetization both reveal sharp superconducting transitions at around 22 K. An estimate on the diamagnetization signal reveals a high Meissner shielding volume. Interestingly, the normal state resistivity exhibits a roughly linear behavior up to 300 K. The superconducting transitions at different magnetic fields were also measured yielding a slope of -dHc2/dT = 3.8 T/K near Tc. Using the Werthamer-Helfand-Hohenberg (WHH) formula, the upper critical field at zero K is found to be about 58 T. Counting the possible number of electrons doped into the system in SrFe2-xIrxAs2, we argue that the superconductivity in the Ir-doped system is different from the Co-doped case, which should add more ingredients to the underlying physics of the iron pnictide superconductors.

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Fei Han, Xiyu Zhu, Ying Jia, Lei Fang, Peng Cheng, Huiqian Luo, Bing Shen, Hai-Hu Wen. 2009-02-24. Superconductivity at 22.3 K in SrFe2-xIrxAs2. https://doi.org/10.1103/physrevb.80.024506

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