Spin-polarized electron (hole) liquids: are π-electrons in metal–benzene sandwiches or injected carriers in C-doped BN nanotube candidates?
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In view of current interest in the emerging field of spin-tronics, we consider here two possible chemically oriented approaches to achieve spin-polarized electron (or hole) liquids. These are by way of (i) metal-benzene sandwiches and (ii) injected carriers in C-doped BN nanotubes. In area (i), the crystal field theory in cylindrical symmetry is employed to discuss in general terms the possible existence of a π-electron spin-polarized liquid, the main sandwich considered being Mnn(C6H6)n+1 for n = 1, 2. As to area (ii) discussed very recently numerically using spin-density functional theory by Guo et al. [Solid State Commun., 137, 246 (2006)], we emphasize the relevance of the local moment criterion derived some decades ago by Stoddart and March [Ann. Phys. (NY), 64, 174 (1971)]. It is stressed that the strength of the (spin-independent) potential due to the C impurities times the Hilbert transform of the band density of states of the nanotube enters the criterion for local moment formation. © 2006 Taylor & Francis.
PHYSICS AND CHEMISTRY OF LIQUIDS
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Klein, D. J., & March, N. H.
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Local Moment Criterion
Spin-polarized Electron Liquids
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