期刊
PHYSICAL REVIEW B
卷 92, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.92.094501
关键词
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资金
- Deutsche Forschungsgemeinschaft (DFG) [GR 1132/15]
- NSF-DMR [1005293]
- NSF [DMR-0654118]
- State of Florida
- U.S. Department of Energy
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1005293] Funding Source: National Science Foundation
Two critical points have been revealed in the normal-state phase diagram of the electron-doped cuprate superconductor Nd2-xCexCuO4 by exploring the Fermi surface properties of high-quality single crystals by high-field magnetotransport. First, the quantitative analysis of the Shubnikov-de Haas effect shows that the weak superlattice potential responsible for the Fermi surface reconstruction in the overdoped regime extrapolates to zero at the doping level x(c) = 0.175 corresponding to the onset of superconductivity. Second, the high-field Hall coefficient exhibits a sharp drop right below optimal doping x(opt) = 0.145 where the superconducting transition temperature is maximum. This drop is most likely caused by the onset of long-range antiferromagnetic ordering. Thus the superconducting dome appears to be pinned by two critical points to the normal state phase diagram.
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