期刊
SCIENCE
卷 348, 期 6232, 页码 317-320出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaa4990
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资金
- U.S. Department of Energy Office of Basic Energy Sciences
- NSF [DMR-1157490]
- State of Florida
- Natural Science and Engineering Research Council of Canada
- Canadian Institute for Advanced Research
- Royal Society
- European Research Council under the European Union [337425]
- European Research Council (ERC) [337425] Funding Source: European Research Council (ERC)
In the quest for superconductors with higher transition temperatures (T-c), one emerging motif is that electronic interactions favorable for superconductivity can be enhanced by fluctuations of a broken-symmetry phase. Recent experiments have suggested the existence of the requisite broken-symmetry phase in the high-T-c cuprates, but the impact of such a phase on the ground-state electronic interactions has remained unclear. We used magnetic fields exceeding 90 tesla to access the underlying metallic state of the cuprate YBa2Cu3O6+delta over a wide range of doping, and observed magnetic quantum oscillations that reveal a strong enhancement of the quasiparticle effective mass toward optimal doping. This mass enhancement results from increasing electronic interactions approaching optimal doping, and suggests a quantum critical point at a hole doping of p(crit) approximate to 0.18.
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