Comparison of stripe modulations in La1.875Ba0.125CuO4 and La1.48Nd0.4Sr0.12CuO4

S. B. Wilkins, M. P. M. Dean, Jörg Fink, Markus Hücker, J. Geck, V. Soltwisch, E. Schierle, E. Weschke, G. Gu, S. Uchida, N. Ichikawa, J. M. Tranquada, and J. P. Hill
Phys. Rev. B 84, 195101 – Published 2 November 2011

Abstract

We report combined soft and hard x-ray scattering studies of the electronic and lattice modulations associated with stripe order in La1.875Ba0.125CuO4 and La1.48Nd0.4Sr0.12CuO4. We find that the amplitude of both the electronic modulation of the hole density and the strain modulation of the lattice is significantly larger in La1.875Ba0.125CuO4 than in La1.48Nd0.4Sr0.12CuO4 and is also better correlated. The in-plane correlation lengths are isotropic in each case; for La1.875Ba0.125CuO4, ξhole=255±5 Å, whereas for La1.48Nd0.4Sr0.12CuO4, ξhole=111±7 Å. We find that the modulations are temperature independent in La1.875Ba0.125CuO4 in the low temperature tetragonal phase. In contrast, in La1.48Nd0.4Sr0.12CuO4, the amplitude grows smoothly from zero, beginning 13 K below the LTT phase transition. We speculate that the reduced average tilt angle in La1.875Ba0.125CuO4 results in reduced charge localization and incoherent pinning, leading to the longer correlation length and enhanced periodic modulation amplitude.

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  • Received 7 August 2011

DOI:https://doi.org/10.1103/PhysRevB.84.195101

©2011 American Physical Society

Authors & Affiliations

S. B. Wilkins1,*, M. P. M. Dean1, Jörg Fink2,3, Markus Hücker1, J. Geck2, V. Soltwisch3, E. Schierle3, E. Weschke3, G. Gu1, S. Uchida4, N. Ichikawa5, J. M. Tranquada1, and J. P. Hill1

  • 1Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 2Leibniz-Institute for Solid State and Materials Research Dresden, P. O. Box 270116, D-01171 Dresden, Germany
  • 3Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, D-12489 Berlin, Germany
  • 4Department of Physics, University of Tokyo, Tokyo 113-8656, Japan
  • 5Institute for Chemical Research, Kyoto University, Gokasho, Uji 610-0011, Japan

  • *swilkins@bnl.gov

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Vol. 84, Iss. 19 — 15 November 2011

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