Abstract:
:Physical and electrochemical phenomena at the surfaces of transition metal oxides and their coupling to local functionality remains one of the enigmas of condensed matter physics. Understanding the emergent physical phenomena at surfaces requires the capability to probe the local composition, map order parameter fields and establish their coupling to electronic properties. Here we demonstrate that measuring the sub-30-pm displacements of atoms from high-symmetry positions in the atomically resolved scanning tunnelling microscopy allows the physical order parameter fields to be visualized in real space on the single-atom level. Here, this local crystallographic analysis is applied to the in-situ-grown manganite surfaces. In particular, using direct bond-angle mapping we report direct observation of structural domains on manganite surfaces, and trace their origin to surface-chemistry-induced stabilization of ordered Jahn-Teller displacements. Density functional calculations provide insight into the intriguing interplay between the various degrees of freedom now resolved on the atomic level.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Gai Z,Lin W,Burton JD,Fuchigami K,Snijders PC,Ward TZ,Tsymbal EY,Shen J,Jesse S,Kalinin SV,Baddorf APdoi
10.1038/ncomms5528subject
Has Abstractpub_date
2014-07-24 00:00:00pages
4528issn
2041-1723pii
ncomms5528journal_volume
5pub_type
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