Enhanced Antiferromagnetic Exchange between Magnetic Impurities in a Superconducting Host

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Enhanced Antiferromagnetic Exchange between Magnetic Impurities in a Superconducting Host

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Title: Enhanced Antiferromagnetic Exchange between Magnetic Impurities in a Superconducting Host
Author: Yao, Norman Ying; Glazman, Leonid I; Demler, Eugene A.; Lukin, Mikhail D.; Sau, Jay D.

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Citation: Yao, 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.
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Abstract: It 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.
Published Version: doi:10.1103/PhysRevLett.113.087202
Other Sources: http://arxiv.org/abs/1309.2633
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:13421142
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