Fermi surface reconstruction in electron-doped cuprates without antiferromagnetic long-range order
Abstract
Fermi surface (FS) topology is a fundamental property of metals and superconductors. In electron-doped cuprate Nd2-xCexCuO4 (NCCO), an unexpected FS reconstruction has been observed in optimal- and over-doped 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 over-doped 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.
Keywords
Cite
@article{arxiv.1811.04992,
title = {Fermi surface reconstruction in electron-doped cuprates without antiferromagnetic long-range order},
author = {J. -F. He and C. R. Rotundu and M. S. Scheurer and Y. He and M. Hashimoto and K. Xu and Y. Wang and E. W. Huang and T. Jia and S. -D. Chen and B. Moritz and D. -H. Lu and Y. S. Lee and T. P. Devereaux and Z. -X. Shen},
journal= {arXiv preprint arXiv:1811.04992},
year = {2019}
}