Chemically induced Jahn–Teller ordering on manganite surfaces

Zheng Gai (), Wenzhi Lin, J. D. Burton, K. Fuchigami, P. C. Snijders, T. Z. Ward, Evgeny Y. Tsymbal, J. Shen, Stephen Jesse, Sergei V. Kalinin and Arthur P. Baddorf
Additional contact information
Zheng Gai: Center for Nanophase Materials Sciences, Oak Ridge National Laboratory
Wenzhi Lin: Center for Nanophase Materials Sciences, Oak Ridge National Laboratory
J. D. Burton: University of Nebraska Lincoln
K. Fuchigami: Research Laboratory, IHI Corporation
P. C. Snijders: Oak Ridge National Laboratory
T. Z. Ward: Oak Ridge National Laboratory
Evgeny Y. Tsymbal: University of Nebraska Lincoln
J. Shen: The University of Tennessee
Stephen Jesse: Center for Nanophase Materials Sciences, Oak Ridge National Laboratory
Sergei V. Kalinin: Center for Nanophase Materials Sciences, Oak Ridge National Laboratory
Arthur P. Baddorf: Center for Nanophase Materials Sciences, Oak Ridge National Laboratory

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms5528

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