Ferromagnetic instabilities in atomically-thin lithium and sodium wires
A. Bergara, J. B. Neaton, N. W. Ashcroft
Abstract
Using density functional theory the ground state structural, electronic, and magnetic properties of monatomic lithium and sodium chains with low average density are investigated. A metallic, zigzag ground state structure is predicted but, most interestingly, stable equilibria for chains under tension are predicted to be ferromagnetic, which can be traced to exchange effects arising from occupation of the second subband as a function of the interatomic distance.
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