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  • Title: Enhanced antiferromagnetic exchange between magnetic impurities in a superconducting host.
    Author: Yao NY, Glazman LI, Demler EA, Lukin MD, Sau JD.
    Journal: Phys Rev Lett; 2014 Aug 22; 113(8):087202. PubMed ID: 25192121.
    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 the superconducting coherence length (r ≲ ξ), this exchange is thought to be dominated by Ruderman-Kittel-Kasuya-Yosida (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 nonperturbative analysis and demonstrate that the presence of Yu-Shiba-Rusinov bound states induces a strong 1/r(2) antiferromagnetic interaction that can dominate over conventional RKKY even at distances significantly smaller than the coherence length (r ≪ ξ). Experimental signatures, implications, and applications are discussed.
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