Enhanced Antiferromagnetic Exchange between Magnetic Impurities in a Superconducting Host
MetadataShow full item record
CitationYao, N. Y., L. I. Glazman, E. A. Demler, M. D. Lukin, and J. D. Sau. 2014. “Enhanced Antiferromagnetic Exchange Between Magnetic Impurities in a Superconducting Host.” Physical Review Letters 113 (8) (August). doi:10.1103/physrevlett.113.087202.
AbstractIt is generally believed that superconductivity only weakly affects the indirect exchange between
magnetic impurities. If the distance r between impurities is smaller than than the superconducting
coherence length \((r \lesssim \xi)\) , this exchange is thought to be dominated by RKKY interactions, identical
to the those in a normal metallic host. This perception is based on a perturbative treatment of
the exchange interaction. Here, we provide a non-perturbative analysis and demonstrate that the
presence of Yu-Shiba-Rusinov bound states induces a strong \(1/r^2\) anti-ferromagnetic interaction that
can dominate over conventional RKKY even at distances significantly smaller than the coherence
length \((r\ll \xi )\). Experimental signatures, implications and applications are discussed.
Citable link to this pagehttp://nrs.harvard.edu/urn-3:HUL.InstRepos:13421142
- FAS Scholarly Articles