Manifestations of Broken Symmetry: The Surface Phases of Ca2xSrxRuO4

R. G. Moore, V. B. Nascimento, Jiandi Zhang, J. Rundgren, R. Jin, D. Mandrus, and E. W. Plummer
Phys. Rev. Lett. 100, 066102 – Published 13 February 2008

Abstract

The surface structural phases of Ca2xSrxRuO4 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 xc0.5.

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  • Received 14 September 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.066102

©2008 American Physical Society

Authors & Affiliations

R. G. Moore1, V. B. Nascimento1, Jiandi Zhang2,3, J. Rundgren4, R. Jin3, D. Mandrus3, and E. W. Plummer1,3,5

  • 1Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 2Department of Physics, Florida International University, Miami, Florida 33199, USA
  • 3Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 4Department of Theoretical Physics, Alba Nova Research Center, Royal Institute of Technology (KTH), SE-106 91 Stockholm, Sweden
  • 5Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

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Issue

Vol. 100, Iss. 6 — 15 February 2008

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