Manifestations of Broken Symmetry: The Surface Phases of Ca(2-x)Sr(x)RuO4
R. G. Moore, V. B. Nascimento, Jiandi Zhang, J. Rundgren, R. Jin, D., Mandrus, E. W. Plummer
TL;DR
This study investigates how surface structural phases of Ca(2-x)Sr(x)RuO4 differ from bulk, revealing enhanced rotational distortions, suppressed transition temperatures, and surface-specific electronic phenomena like a Mott transition.
Contribution
It provides the first detailed analysis of surface phases in Ca(2-x)Sr(x)RuO4 using quantitative LEED, highlighting the effects of broken symmetry on surface structural and electronic properties.
Findings
Surface phases show enhanced RuO6 rotational distortion.
Surface transition temperatures are suppressed compared to bulk.
A surface Mott insulator state appears at x=0.1.
Abstract
The surface structural phases of Ca(2-x)Sr(x)RuO(4) are investigated using quantitative Low Energy Electron Diffraction. The broken symmetry at the surface enhances the structural instability against the RuO6 rotational distortion while diminishing the instability against the RuO6 tilt distortion occurring within the bulk crystal. As a result, suppressed structural and electronic surface phase transition temperatures are observed, including the appearance of an inherent Mott metal-to-insulator transition for x = 0.1 and possible modifications of the surface quantum critical point near xc ~ 0.5.
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