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    "title": "Complementary X-ray evidence of charge order competing with superconductivity in underdoped cuprates",
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        "description": "The hard X-ray experiment primarily measures atomic displacements in one detwinned oxygen-ordered sample and cannot distinguish two coexisting wavevectors from separate domains. The resonant study probes the electronic response in selected samples, with peaks reported at hole dopings 0.09–0.13; its approximately 130 meV instrumental energy resolution does not resolve the low-energy fluctuation spectrum. Its interpretation of charge correlations uses polarization comparisons and model assumptions. The studies have distinct methods and source-specific author lists; these observations do not establish a universal mechanism for high-temperature superconductivity or prove Fermi-surface reconstruction.",
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      "statement": "# Complementary X-ray evidence of charge order competing with superconductivity in underdoped cuprates\n\nIn 2012 Chang and colleagues used nonresonant hard X-ray diffraction on an underdoped YBa₂Cu₃O₆.₆₇ crystal to identify incommensurate lattice-modulation peaks associated with charge order; the peak weakened below the superconducting transition and increased under an applied magnetic field. Separately, Ghiringhelli and colleagues used resonant soft X-ray scattering near the Cu L₃ edge on underdoped Y- and Nd-based 123 cuprates, identifying a quasi-elastic charge-associated peak near 0.31 reciprocal lattice units. Its intensity and correlation length rose on cooling toward the superconducting transition and fell below it, supporting competition between the measured charge correlations and superconductivity.\n\n## Scientific scope\n\nThe hard X-ray experiment primarily measures atomic displacements in one detwinned oxygen-ordered sample and cannot distinguish two coexisting wavevectors from separate domains. The resonant study probes the electronic response in selected samples, with peaks reported at hole dopings 0.09–0.13; its approximately 130 meV instrumental energy resolution does not resolve the low-energy fluctuation spectrum. Its interpretation of charge correlations uses polarization comparisons and model assumptions. The studies have distinct methods and source-specific author lists; these observations do not establish a universal mechanism for high-temperature superconductivity or prove Fermi-surface reconstruction.\n\n## Reading status\n\nThis is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.\n\n## People and systems\n\nJ. Chang; E. Blackburn; A. T. Holmes; N. B. Christensen; J. Larsen; J. Mesot; Ruixing Liang; D. A. Bonn; W. N. Hardy; A. Watenphul; M. v. Zimmermann; E. M. Forgan; S. M. Hayden; G. Ghiringhelli; M. Le Tacon; M. Minola\n\nThese are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.\n\n\n\n## Original sources\n\n- [Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3Oy](https://arxiv.org/pdf/1206.4333v1)\n- [Long-range incommensurate charge fluctuations in (Y,Nd)Ba2Cu3O6+x](https://arxiv.org/pdf/1207.0915v1)\n",
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      "title": "Complementary X-ray evidence of charge order competing with superconductivity in underdoped cuprates"
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    "scope": "In 2012 Chang and colleagues used nonresonant hard X-ray diffraction on an underdoped YBa₂Cu₃O₆.₆₇ crystal to identify incommensurate lattice-modulation peaks associated with charge order; the peak weakened below the superconducting transition and increased under an applied magnetic field. Separately, Ghiringhelli and colleagues used resonant soft X-ray scattering near the Cu L₃ edge on underdoped Y- and Nd-based 123 cuprates, identifying a quasi-elastic charge-associated peak near 0.31 reciprocal lattice units. Its intensity and correlation length rose on cooling toward the superconducting transition and fell below it, supporting competition between the measured charge correlations and superconductivity. The hard X-ray experiment primarily measures atomic displacements in one detwinned oxygen-ordered sample and cannot distinguish two coexisting wavevectors from separate domains. The resonant study probes the electronic response in selected samples, with peaks reported at hole dopings 0.09–0.13; its approximately 130 meV instrumental energy resolution does not resolve the low-energy fluctuation spectrum. Its interpretation of charge correlations uses polarization comparisons and model assumptions. The studies have distinct methods and source-specific author lists; these observations do not establish a universal mechanism for high-temperature superconductivity or prove Fermi-surface reconstruction.",
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