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Anomalous conductance oscillations and half-metallicity in atomic Ag-O chains

  • Strange, Mikkel
  • Thygesen, Kristian Sommer
  • Sethna, James P
  • Jacobsen, Karsten Wedel
Publication Date
Jan 01, 2008
Online Research Database In Technology
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Using spin density functional theory, we study the electronic and magnetic properties of atomically thin, suspended chains containing silver and oxygen atoms in an alternating sequence. Chains longer than 4 atoms develop a half-metallic ground state implying fully spin-polarized charge carriers. The conductances of the chains exhibit weak even-odd oscillations around an anomalously low value of 0.1G(0) (G(0) = 2e(2)/h) which coincide with the averaged experimental conductance in the long chain limit. The unusual conductance properties are explained in terms of a resonating-chain model, which takes the reflection probability and phase shift of a single bulk-chain interface as the only input. The model also explains the conductance oscillations for other metallic chains.

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