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|Title:||Easy-axis ferromagnetic chain on a metallic surface||Authors:||Lobos, A.M.
|Issue Date:||6-Mar-2013||Citation:||Lobos, A.M., Cazalilla, M.A. (2013-03-06). Easy-axis ferromagnetic chain on a metallic surface. Journal of Physics Condensed Matter 25 (9) : -. ScholarBank@NUS Repository. https://doi.org/10.1088/0953-8984/25/9/094008||Abstract:||The phases and excitation spectrum of an easy-axis ferromagnetic chain of S = 1/2 magnetic impurities built on the top of a clean metallic surface are studied. As a function of the (Kondo) coupling to the metallic surface and at low temperatures, the spin chain exhibits a quantum phase transition from an Ising ferromagnetic phase with long-range order to a paramagnetic phase where quantum fluctuations destroy the magnetic order. In the paramagnetic phase, the system consists of a chain of Kondo singlets where the impurities are completely screened by the metallic host. In the ferromagnetic phase, the excitations above the Ising gap are damped magnons, with a finite lifetime arising due to the coupling to the substrate. We discuss the experimental consequences of our results to spin-polarized electron energy loss spectroscopy, and we finally analyze possible extensions to spin chains with S > 1/2. © 2013 IOP Publishing Ltd.||Source Title:||Journal of Physics Condensed Matter||URI:||http://scholarbank.nus.edu.sg/handle/10635/126658||ISSN:||09538984||DOI:||10.1088/0953-8984/25/9/094008|
|Appears in Collections:||Staff Publications|
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