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He, Junfeng; Rotundu, Costel R.; Scheurer, Mathias S.; He, Yu; Hashimoto, Makoto; Xu, Ke-Jun; Wang, Yao; Huang, Edwin W.; Jia, Tao; Chen, Sudi; Moritz, Brian; Lu, Donghui; Lee, Young S.; Devereaux, Thomas P.; Shen, Zhi-xun
Proceedings of the National Academy of Sciences - PNAS, 02/2019, Letnik: 116, Številka: 9Journal Article
Fermi surface (FS) topology is a fundamental property of metals and superconductors. In electron-doped cuprate Nd2−x CeₓCuO₄ (NCCO), an unexpected FS reconstruction has been observed in optimal- and overdoped regime (x = 0.15–0.17) by quantum oscillation measurements (QOM). This is all the more puzzling because neutron scattering suggests that the antiferromagnetic (AFM) long-range order, which is believed to reconstruct the FS, vanishes before x = 0.14. To reconcile the conflict, a widely discussed external magnetic-field–induced AFM long-range order in QOM explains the FS reconstruction as an extrinsic property. Here, we report angle-resolved photoemission (ARPES) evidence of FS reconstruction in optimal- and overdoped NCCO. The observed FSs are in quantitative agreement with QOM, suggesting an intrinsic FS reconstruction without field. This reconstructed FS, despite its importance as a basis to understand electron-doped cuprates, cannot be explained under the traditional scheme. Furthermore, the energy gap of the reconstruction decreases rapidly near x = 0.17 like an order parameter, echoing the quantum critical doping in transport. The totality of the data points to a mysterious order between x = 0.14 and 0.17, whose appearance favors the FS reconstruction and disappearance defines the quantum critical doping. A recent topological proposal provides an ansatz for its origin.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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