Manifestations of Broken Symmetry: The Surface Phases of Ca(2-x)Sr(x)RuO4

Details Manifestations of Broken Symmetry: The Surface Phases of Ca(2-x)Sr(x)RuO4 Manifestations of Broken Symmetry: The Surface Phases of Ca(2-x)Sr(x)RuO4

2007-11-21

arxiv.org/abs/0711.3487v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.100.066102

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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