期刊
SCIENCE ADVANCES
卷 2, 期 8, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.1600782
关键词
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资金
- Canadian Institute for Advanced Research (CIFAR) Global Academy
- Max Planck-University of British Columbia Centre for Quantum Materials
- Killam Fellowship
- Alfred P. Sloan Fellowship
- Natural Sciences and Engineering Research Council of Canada's (NSERC's) Steacie Memorial Fellowship
- Alexander von Humboldt Fellowship
- Canada Research Chairs Program
- NSERC
- Canada Foundation for Innovation (CFI)
- CIFAR Quantum Materials
- NSF [1006617, DMR-1410665]
- NSF through University of Minnesota Materials Research Science and Engineering Center [DMR-1420013]
- CFI
- National Research Council Canada
- Canadian Institutes of Health Research
- government of Saskatchewan
- Western Economic Diversification Canada
- University of Saskatchewan
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1006617, 1410665] Funding Source: National Science Foundation
Understanding the interplay between charge order (CO) and other phenomena (for example, pseudogap, antiferromagnetism, and superconductivity) is one of the central questions in the cuprate high-temperature superconductors. The discovery that similar forms of CO exist in both hole-and electron-doped cuprates opened a path to determine what subset of the CO phenomenology is universal to all the cuprates. We use resonant x-ray scattering to measure the CO correlations in electron-doped cuprates (La2-xCexCuO4 and Nd2-xCexCuO4) and their relationship to antiferromagnetism, pseudogap, and superconductivity. Detailed measurements of Nd2-xCexCuO4 show that CO is present in the x = 0.059 to 0.166 range and that its doping-dependent wave vector is consistent with the separation between straight segments of the Fermi surface. The CO onset temperature is highest between x = 0.106 and 0.166 but decreases at lower doping levels, indicating that it is not tied to the appearance of antiferromagnetic correlations or the pseudogap. Near optimal doping, where the CO wave vector is also consistent with a previously observed phonon anomaly, measurements of the CO below and above the superconducting transition temperature, or in a magnetic field, show that the CO is insensitive to superconductivity. Overall, these findings indicate that, although verified in the electron-doped cuprates, material-dependent details determine whether the CO correlations acquire sufficient strength to compete for the ground state of the cuprates.
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