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

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.

arXiv comment4 pages, 4 figures

References in corpus (4)

• Structural and magnetic aspects of the metal insulator transition in Ca${}_{2-x}$Sr${}_x$RuO${}_4$
• Magnetic Phase Diagram of Ca2-xSrxRuO4 Governed by Structural Distortions
• Orbital Dependent Phase Control in Ca2-xSrxRuO4
• Subband filling and Mott transition in Ca_{2-x}Sr_xRuO_4

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• Phonon softening and anomalous mode near the $x_c=0.5$ quantum critical point in Ca${}_{2-x}$Sr${}_x$RuO${}_4$