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Oh, Yoon Seok
Laboratory for Strong Correlation in Quantum Materials
Research Interests
  • Materials for Quantum Information Processing, Transport, and Storage
  • Quantum Magnet
  • Multiferroic

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Observation of the Josephson effect in Pb/Ba1−xKxFe2As2 single crystal junctions

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Title
Observation of the Josephson effect in Pb/Ba1−xKxFe2As2 single crystal junctions
Author
Zhang, XiaohangOh, Yoon SeokLiu, YongYan, LiqinKim, Kee HoonGreene, Richard L.Takeuchi, Ichiro
Keywords
Conventional superconductors; Counter electrodes; I - v curves; In-plane magnetic fields; Josephson couplings; Josephson currents; Josephson effects; Josephson junctions; Modulation periods; Pnictide; Resistively shunted junctions
Issue Date
2009-04
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW LETTERS, v.102, no.14, pp.147002 -
Abstract
We have fabricated c-axis Josephson junctions on single crystals of Ba1-xKxFe2As2 by using Pb as the counterelectrode in two geometries, planar and point contact. Junctions in both geometries show resistively shunted junction I-V curves below the T-C of the counterelectrode. Microwave induced steps were observed in the I-V curves, and the critical currents are suppressed with an in-plane magnetic field with well-defined modulation periods indicating that the Josephson current is flowing in a manner consistent with the small to intermediate sized junction limit. ICRN products of up to 0.3 mV have been observed in these junctions at 4.2 K. The observation of Josephson coupling along the c axis between Ba1-xKxFe2As2 and a conventional superconductor suggests the existence of an s-wave symmetry in this class of iron pnictide superconductors.
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DOI
10.1103/PhysRevLett.102.147002
ISSN
0031-9007
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PHY_Journal Papers
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