Incommensurate Sinusoidal Oxygen Modulations in Layered Manganites La1xSr1+xMnO4 (x0.5)

Joaquín García, Javier Herrero-Martín, Gloria Subías, Javier Blasco, J. S. Andreu, and M. Concepción Sánchez
Phys. Rev. Lett. 109, 107202 – Published 4 September 2012

Abstract

We have studied the incommensurate-ordered phase in overdoped La0.4Sr1.6MnO4 by resonant x-ray diffraction at the Mn K edge. Weak resonant superlattice (h±0.2h±0.20) and (h±0.4h±0.40) reflections of the tetragonal structure were found below 240K. The energy, azimuth angle, and polarization dependencies of the resonant scattering have revealed sinusoidal modulations of the oxygen motions that are transverse and longitudinal to the tetragonal [110] direction. This result discards (Mn3+,Mn4+)-like stripe-type order but point to a charge-density-modulation picture.

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  • Received 11 July 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.107202

© 2012 American Physical Society

Authors & Affiliations

Joaquín García1,*, Javier Herrero-Martín2, Gloria Subías1, Javier Blasco1, J. S. Andreu2, and M. Concepción Sánchez1

  • 1Instituto de Ciencia de Materiales de Aragón, CSIC- Universidad de Zaragoza, C/ Pedro Cerbuna 12, E-50009 Zaragoza, Spain
  • 2Institut de Ciència de Materials de Barcelona- CSIC, Campus Universitari de Bellaterra, E-08193, Bellaterra, Barcelona, Spain

  • *Author to whom correspondence should be addressed. jgr@unizar.es

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Vol. 109, Iss. 10 — 7 September 2012

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