Bulletin of the American Physical Society
APS March Meeting 2010
Volume 55, Number 2
Monday–Friday, March 15–19, 2010; Portland, Oregon
Session H1: Charge and Spin Transport in Josephson and Proximity Devices
8:00 AM–11:00 AM,
Tuesday, March 16, 2010
Room: Oregon Ballroom 201
Sponsoring Unit: DCMP
Chair: James Sauls, Northwestern University
Abstract ID: BAPS.2010.MAR.H1.1
Abstract: H1.00001 : Non-sinusoidal current-phase relations in SFS pi-Josephson junctions*
8:00 AM–8:36 AM
Preview Abstract Abstract
Dale J. Van Harlingen
(University of Illinois at Urbana-Champaign)
We report the direct observation of a sin(2$\phi )$ component in the current-phase relation (CPR) of Superconductor-Ferromagnet-Superconductor (SFS) Josephson junctions. The deviation from a sinusoidal CPR is most evident near the crossover between the 0-junction to $\pi $-junction states reached by tuning the thickness of the ferromagnet barrier and the temperature. We measure the CPR in Nb-CuNi-Nb junctions using a phase-sensitive Josephson interferometer technique in which the junctions are incorporated into a superconducting loop coupled to a dc SQUID. We correlate the CPR data with measurements of subharmonic Shapiro steps and anomalous critical current diffraction patterns that have previously been cited as evidence for higher-order Josephson tunneling components. We will discuss possible origins and implications for the non-sinusoidal component. In collaboration with M.J.A. Stoutimore (University of Illinois at Urbana-Champaign) and A.Yu. Rusanov, V.A. Oboznov, V.V. Bolginov, A.N. Rossolenko, and V.V. Ryazanov (Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Russia).
*Work supported by the National Science Foundation grant NSF DMR 07-05214.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.MAR.H1.1
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