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Title: Easy-axis ferromagnetic chain on a metallic surface
Authors: Lobos, A.M.
Cazalilla, M.A. 
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.
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
ISSN: 09538984
DOI: 10.1088/0953-8984/25/9/094008
Appears in Collections:Staff Publications

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