Wiley, International Journal of Quantum Chemistry, 2(91), p. 239-244, 2002
DOI: 10.1002/qua.10414
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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. ; Comment: Revised version; 4 pages, 4 figures; to appear in International Journal of Quantum Chemistry (2003)