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Josephson effect between electron-doped and hole-doped iron pnictide single crystals

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arxiv 0907.4456 v1 pith:U2MRBB4B submitted 2009-07-26 cond-mat.supr-con

Josephson effect between electron-doped and hole-doped iron pnictide single crystals

Xiaohang Zhang , Shanta Saha , Nicholas P. Butch , Kevin Kirshenbaum , Johnpierre Paglione , Richard L. Greene , Yong Liu , Liqin Yan
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Yoon Seok Oh Kee Hoon Kim Ichiro Takeuchi
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classification cond-mat.supr-con
keywords effectjosephsonironpnictidecrystalsjunctionjunctionsobserved
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We have observed the Josephson effect in junctions formed between single crystals of SrFe1.74Co0.26As2 and Ba0.23K0.77Fe2As2. I-V curves showed resistively-shunted junction characteristics, and the ac Josephson effect was observed under microwave irradiation. By applying an in-plane magnetic field, the critical current is completely modulated and shows a relatively symmetric diffraction pattern, consistent with the intermediate junction limit. The observation of the Josephson effect in the p-n bicrystal structure not only has significant implications for designing phase-sensitive junctions to probe the pairing symmetry of iron pnictide superconductors, but also represents an important step in developing all iron pnictide devices for applications.

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