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- W4281617085 abstract "Magnetic adatoms on a superconducting substrate undergo a quantum phase transition as their exchange coupling to the conduction electrons increases. For quantum spins, this transition is accompanied by screening of the adatom spin. Here, we explore the consequences of this screening for the phase diagrams and subgap excitation spectra of dimers of magnetic adatoms coupled by hybridization of their Yu-Shiba-Rusinov states and spin-spin interactions. We specifically account for higher spins, single-ion anisotropy, Ruderman-Kittel-Kasuya-Yosida coupling, and Dzyaloshinsky-Moriya interactions relevant in transition-metal and rare-earth systems. Our flexible approach based on a zero-bandwidth approximation provides detailed physical insight and is in excellent qualitative agreement with available numerical-renormalization group calculations on monomers and dimers. Remarkably, we find that even in the limit of large impurity spins or strong single-ion anisotropy, the phase diagrams for dimers of quantum spins remain qualitatively distinct from phase diagrams based on classical spins, highlighting the need for a theory of quantum Yu-Shiba-Rusinov dimers." @default.
- W4281617085 created "2022-06-13" @default.
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- W4281617085 date "2022-06-07" @default.
- W4281617085 modified "2023-10-15" @default.
- W4281617085 title "Quantum Yu-Shiba-Rusinov dimers" @default.
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- W4281617085 doi "https://doi.org/10.1103/physrevb.105.235406" @default.
- W4281617085 hasPublicationYear "2022" @default.
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