Local electronic structure of Fe(001) surfaces studied by scanning tunneling spectroscopy

Article

关键词: METAL-SURFACE;    IMPURITIES;    MICROSCOPY;    STATES;    V(001);   

DOI  :  10.1103/PhysRevB.68.045422

来源: SCIE

【 摘 要 】

Scanning tunneling spectroscopy is used to study the local electronic structure of Fe(001) whiskers. The influence of a voltage dependent background on the apparent peak energies in the dI/dV curves is discussed. A relation between this background and the apparent barrier height is established. The previously reported spin-polarized d(z)2-like surface state is shown to shift by an amount of 0.04 eV to higher energies at isolated oxygen impurities on the Fe(001) surface. The surface state disappears on both [100] and [110] directed steps. Finally, we investigated size effects by studying the behavior of the surface state on nanometer-sized Fe islands. Besides the surface-state quenching at the step edges, a peak shift to higher energies is observed for decreasing island sizes.

【 授权许可】

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