Properties of charge density waves in La${}_{2-x}$Ba${}_x$CuO${}_4$

Abstract

We report a comprehensive x-ray scattering study of charge density wave (stripe) ordering in $\mathrm{L}{\mathrm{a}}_{2-\mathrm{x}}\mathrm{B}{\mathrm{a}}_{\mathrm{x}}\mathrm{Cu}{\mathrm{O}}_4(\mathrm{x}\approx 1/8)$, for which the superconducting $T_c$ is greatly suppressed. Strong superlattice reflections corresponding to static ordering of charge stripes were observed in this sample. The structural modulation at the lowest temperature was deduced based on the intensity of over 70 unique superlattice positions surveyed. We found that the charge order in this sample is described with one-dimensional charge density waves, which have incommensurate wave-vectors (0.23, 0, 0.5) and (0, 0.23, 0.5) respectively on neighboring $\mathrm{Cu}{\mathrm{O}}_2$ planes. The structural modulation due to the charge density wave order is simply sinusoidal, and no higher harmonics were observed. Just below the structural transition temperature, short-range charge density wave correlation appears, which develops into a large scale charge ordering around 40 K, close to the spin density wave ordering temperature. However, this charge ordering fails to grow into a true long range order, and its correlation length saturates at $\sim 230\mathring{A}$, and slightly decreases below about 15 K, which may be due to the onset of two-dimensional superconductivity.

11 pages, 9 figures

References in corpus (8)

• A `checkerboard' electronic crystal state in lightly hole-doped Ca_{2-x}Na_{x}CuO_{2}Cl_{2}
• An Intrinsic Bond-Centered Electronic Glass with Unidirectional Domains in Underdoped Cuprates
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• The Ground State of the Pseudogap in Cuprate Superconductors
• Distinguishing Patterns of Charge Order: Stripes or Checkerboards
• From stripe to checkerboard order on the square lattice in the presence of quenched disorder
• Charge order, metallic behavior and superconductivity in La_{2-x}Ba_xCuO_4 with x=1/8
• Magnetic field dependence of charge stripe order in La2-xBaxCuO4 (x~1/8)

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