Doping effect on pairing symmetry in cuprate superconductors
C.C. Tsuei, J.R. Kirtley, et al.
SNS 2004
The current-voltage characteristics of Superconducting Quantum Interference Devices (SQUIDs) are known to modulate as a function of applied magnetic field with a period of one flux quantum Φ0 = h/2e. Here we report on the fabrication and properties of SQUIDs modulating with a fundamental period of 1/2 × Φ0. The characteristics of these bicrystal SQUIDs are consistent with either a strong sin(2ψ) component of the current-phase relation of the Josephson current, or with an interaction between the Cooper pairs, causing an admixture of quartets to the condensate.
C.C. Tsuei, J.R. Kirtley, et al.
SNS 2004
V. Scagnoli, U. Staub, et al.
Physica B: Condensed Matter
C.C. Tsuei, J.R. Kirtley, et al.
Physical Review Letters
R.G. Mints, Ilya Papiashvili, et al.
Physical Review Letters