title: Chemically induced Jahn-Teller ordering on manganite surfaces.
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.
authors: Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors: Zheng
authors: Z
authors: Gai
authors: Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors: Wenzhi
authors: W
authors: Lin
authors: Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy, University of Nebraska Lincoln, Lincoln, Nebraska 68588, USA.
authors: J D
authors: JD
authors: Burton
authors: Research Laboratory, IHI Corporation, Yokohama, Kanagawa 235-8501, Japan.
authors: K
authors: K
authors: Fuchigami
authors: 1] Materials Sciences and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA [2] Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA.
authors: P C
authors: PC
authors: Snijders
authors: Materials Sciences and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors: T Z
authors: TZ
authors: Ward
authors: Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy, University of Nebraska Lincoln, Lincoln, Nebraska 68588, USA.
authors: Evgeny Y
authors: EY
authors: Tsymbal
authors: 1] Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA [2] State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China.
authors: J
authors: J
authors: Shen
authors: Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors: Stephen
authors: S
authors: Jesse
authors: Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors: Sergei V
authors: SV
authors: Kalinin
authors: Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors: Arthur P
authors: AP
authors: Baddorf