Observation of a discontinous nonmetal-to-metal disorder-to-order transition in 
an alkali overlayer

Watson, G. M.; Brühwiler, P. A.; Sagner, H.-J.; Frank, Karl-Heinz; Plummer, E. W.

doi:10.1103/PhysRevB.50.17678

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Observation of a discontinous nonmetal-to-metal disorder-to-order transition in an alkali overlayer

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Sagner, H.-J.
Fritz Haber Institute, Max Planck Society;

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Frank, Karl-Heinz
Fritz Haber Institute, Max Planck Society;

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Citation

Watson, G. M., Brühwiler, P. A., Sagner, H.-J., Frank, K.-H., & Plummer, E. W. (1994). Observation of a discontinous nonmetal-to-metal disorder-to-order transition in an alkali overlayer. Physical Review B, 50(23), 17 678-17 681. doi:10.1103/PhysRevB.50.17678.

Cite as: https://hdl.handle.net/21.11116/0000-0009-A024-9

Abstract

We report measurements of the coverage-dependent electronic and structural properties of submonolayer Li films, grown on Be(0001). We observe a structural phase transition from a disordered state at low coverages to an ordered hexagonally close-packed structure at high coverages. This structural transition is accompanied by a nonmetal-to-metal transition in the overlayer. The Li overlayer structure was determined using low-energy electron diffraction, while angle-resolved photoemission, inverse photoemission, and core-level spectroscopy were employed to characterize the electronic transformation. For the disordered, low-coverage phase the spectroscopies show only one Li-induced electronic state. This level is centered 3.1 eV above E_F and is completely unoccupied at the lowest coverages studied. At the completion of the first Li adlayer, the overlayer band is metallic.