Atomic-scale visualization of surface-assisted orbital order

機構典藏 > College of Sciences > Graduate Institute & Department of Physics > Journal Article > Item 987654321/117198

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Title:	Atomic-scale visualization of surface-assisted orbital order
Authors:	Kim, Howon;Yoshida, Yasuo;Lee, Chi-Cheng;Chang, Tay-Rong;Jeng, Horng-Tay;Lin, Hsin;Haga, Yoshinori;Fisk, Zachary;Hasegawa, Yukio
Date:	2017-09-22
Issue Date:	2019-10-03 12:10:53 (UTC+8)
Publisher:	American Association for the Advancement of Science
Abstract:	Orbital-related physics attracts growing interest in condensed matter research, but direct real-space access of the orbital degree of freedom is challenging. We report a first, real-space, imaging of a surface-assisted orbital ordered structure on a cobalt-terminated surface of the well-studied heavy fermion compound CeCoIn5. Within small tip-sample distances, the cobalt atoms on a cleaved (001) surface take on dumbbell shapes alternatingly aligned in the [100] and [010] directions in scanning tunneling microscopy topographies. First-principles calculations reveal that this structure is a consequence of the staggered dxz-dyz orbital order triggered by enhanced on-site Coulomb interaction at the surface. This so far overlooked surface-assisted orbital ordering may prevail in transition metal oxides, heavy fermion superconductors, and other materials.
Relation:	Science Advances Vol. 3, no. 9 eaao0362
DOI:	10.1126/sciadv.aao0362
Appears in Collections:	[Graduate Institute & Department of Physics] Journal Article

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