2008/12/31 by Xiaohang Zhang, Yoon Seok Oh, Yong Liu +5
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Intellectual Capital and Performance Analysis #Iron-based superconductors research #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.102.147002
published as Phys. Rev. Lett. 102, 147002 (2009) · 16 pages and 3 figures
arxiv created 2009/02/06 · openalex publication_date 2009/04/09 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We have fabricated c-axis Josephson junctions on single crystals of Ba_1\ensuremath-xKxFe2As2 by using Pb as the counterelectrode in two geometries, planar and point contact. Junctions in both geometries show resistively shunted junction I\mathrm\text\ensuremath-V curves below the TC of the counterelectrode. Microwave induced steps were observed in the I\mathrm\text\ensuremath-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 Ba_1\ensuremath-xKxFe2As2 and a conventional superconductor suggests the existence of an s-wave symmetry in this class of iron pnictide superconductors.