Journal
PHYSICAL REVIEW B
Volume 72, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.72.205428
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Using the relativistic all-electron density-functional calculations on the Au-N (N=2-26) in the generalized gradient approximation, combined with the guided simulated annealing, we have found that the two- to three-dimensional structural transition for Au-N occurs between N=13 and 15, and the Au-N (16 <= N <= 25) prefer also the pyramid-based bulk fragment structures in addition to the Au-20. More importantly, the tubelike structures are found to be the most stable for Au-24 and Au-26, offering another powerful structure competitor with other isomers, e.g., amorphous, bulk fragment, and gold fullerene. The mechanism to cause these unusual Au-N may be attributed to the stronger s-d hybridization and the d-d interaction enhanced by the relativistic effects.
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