Ferromagnetic instabilities in atomically-thin lithium and sodium wires

Details Ferromagnetic instabilities in atomically-thin lithium and sodium wires Ferromagnetic instabilities in atomically-thin lithium and sodium wires

2001-03-23

arxiv.org/abs/cond-mat/0103499v2

Physics

Condensed Matter

Materials Science

Revised version; 4 pages, 4 figures; to appear in International Journal of Quantum Chemistry (2003)

Scientific paper

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 {\it 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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