AWhat changed
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.
Scientific 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.
Evidence
The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. 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.
Contributors
- The named authors in the research record · SCIENCE: These 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.
- Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3Oy
- Long-range incommensurate charge fluctuations in (Y,Nd)Ba2Cu3O6+x
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