Crossover induced by spin-density-wave interference in the coherence of singlet electron pairs in Cr.
To study the interaction of s-wave superconductivity with spin-density waves (SDWs), we have measured a series of Nb/Cr/Nb Josephson junctions and determined the coherence length xi describing the decay of the critical current with Cr thickness, L. We observe a crossover in xi from approximately 14 nm to 4 nm as L increases to 10 nm, which is consistent with a transition from commensurate to incommensurate SDWs expected for this thickness range.
Robinson
J W A
JW
Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, Pembroke Street, CB2 3QZ, United Kingdom. jjr33@cam.ac.uk
Halász
Gábor B
GB
Blamire
M G
MG