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19 April 2024

» arxiv » cond-mat/0401051

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Polar surface engineering in ultra-thin MgO(111)/Ag(111) -- possibility of metal-insulator transition and magnetism
Ryotaro Arita ; Yoshiaki Tanida ; Shiro Entani ; Manabu Kiguchi ; Koichiro Saiki ; Hideo Aoki ;
Date:	6 Dec 2003
Subject:	Materials Science; Mesoscopic Systems and Quantum Hall Effect \| cond-mat.mtrl-sci cond-mat.mes-hall
Abstract:	A recent report [Kiguchi {it et al.}, Phys. Rev. B {f 68}, 115402 (2003)] that the (111) surface of 5 MgO layers grown epitaxially on Ag(111) becomes metallic to reduce the electric dipole moment raises a question of what will happen when we have fewer MgO layers. Here we have revealed, first experimentally with electron energy-loss spectroscopy, that MgO(111) remains metallic even when one-layer thick, and theoretically with the density functional theory that the metallization should depend on the nature of the substrate. We further show, with a spin-density functional calculation, that a ferromagnetic instability may be expected for thicker films.
Source:	arXiv, cond-mat/0401051
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