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

Appl. Phys. Lett. 95, 062510 (2009); doi:10.1063/1.3205123

Published 14 August 2009

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Xiaohang Zhang,1 Shanta R. Saha,1 Nicholas P. Butch,1 Kevin Kirshenbaum,1 Johnpierre Paglione,1 Richard L. Greene,1 Yong Liu,2 Liqin Yan,2 Yoon Seok Oh,2 Kee Hoon Kim,2 and Ichiro Takeuchi3
1Department of Physics and CNAM, University of Maryland, College Park, Maryland 20742, USA
2Department of Physics and Astronomy, CSCMR & FPRD, Seoul National University, Seoul 151-747, Republic of Korea
3Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA
We have observed the Josephson effect in junctions formed between single crystals of SrFe1.74Co0.26As2 and Ba0.23K0.77Fe2As2. The ac Josephson effect was observed under microwave irradiation in the I-V characteristics. 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. ©2009 American Institute of Physics
History: Received 3 July 2009; accepted 24 July 2009; published 14 August 2009
Permalink: http://link.aip.org/link/?APPLAB/95/062510/1
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KEYWORDS and PACS

Keywords
PACS
  • 74.50.+r
    Superconductor tunneling phenomena; point contacts, weak links, Josephson effects
  • 72.30.+q
    High-frequency effects; plasma effects in electronic transport
  • 68.35.-p
    Solid surfaces and solid-solid interfaces: structure and energetics
  • 74.25.Sv
    Critical currents in superconductors
  • 74.25.Fy
    Transport properties of superconductors
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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