Universal Stripe Symmetry of Short-Range Charge Density Waves in Cuprate Superconductors.
basic_science · Level V
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- Record sourced from PubMed, PMID 37830432.
- Also identified by DOI 10.1002/adma.202307515.
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Abstract
The omnipresence of charge density waves (CDWs) across almost all cuprate families underpins a common organizing principle. However, a longstanding debate of whether its spatial symmetry is stripe or checkerboard remains unresolved. While CDWs in lanthanum- and yttrium-based cuprates possess a stripe symmetry, distinguishing these two scenarios is challenging for the short-range CDW in bismuth-based cuprates. Here, high-resolution resonant inelastic x-ray scattering is employed to uncover the spatial symmetry of the CDW in Bi<sub>2</sub> Sr<sub>2 - x</sub> La<sub>x</sub> CuO<sub>6 + δ</sub> . Across a wide range of doping and temperature, anisotropic CDW peaks with elliptical shapes are found in reciprocal space. Based on Fourier transform analysis of real-space models, the results are interpreted as evidence of unidirectional charge stripes, hosted by mutually 90°-rotated anisotropic domains. This work paves the way for a unified symmetry and microscopic description of CDW order in cuprates.