Phys. Rev. B 66, 092501 (2002) [4 pages]

X-ray diffraction study of lattice modulations in an underdoped YBa₂Cu₃O_6+x superconductor

Abstract

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Zahirul Islam^1,*, S. K. Sinha¹, D. Haskel¹, J. C. Lang¹, G. Srajer¹, B. W. Veal², D. R. Haeffner¹, and H. A. Mook³
¹Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
²Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
³Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831

Received 24 June 2002; published 9 September 2002

We report a temperature-dependent increase below ∼220 K of diffuse superlattice peaks corresponding to q₀=(∼2/5,0,0) in an underdoped YBa₂Cu₃O_6+x superconductor (x≈0.63). These peaks reveal strong c-axis correlations involving the CuO₂ bilayers, show a nonuniform increase below ∼220K with a plateau for ∼100–160K, and appear to saturate in the superconducting phase. We propose that this temperature dependence of the superlattice peaks is a possible manifestation of charge stripes in the CuO₂ planes which are coupled to the oxygen-ordered superstructure.

URL:

http://link.aps.org/doi/10.1103/PhysRevB.66.092501

DOI:

10.1103/PhysRevB.66.092501

PACS:

74.72.Bk, 61.10.Eq, 74.25.-q

^*Email address: zahir@aps.anl.gov

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Phys. Rev. B 66, 092501 (2002) [4 pages]

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X-ray diffraction study of lattice modulations in an underdoped YBa₂Cu₃O_6+x superconductor