Fermi surface reconstruction in electron-doped cuprates without antiferromagnetic long-range order

Proceedings of the National Academy of Sciences of the United States of America
Junfeng HeZ-X Shen

Abstract

Fermi surface (FS) topology is a fundamental property of metals and superconductors. In electron-doped cuprate Nd2-x Ce x CuO4 (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 ap...Continue Reading

References

Oct 3, 2001·Physical Review Letters·N P ArmitageM Greven
May 11, 2012·Proceedings of the National Academy of Sciences of the United States of America·Nicholas P ButchJohnpierre Paglione
Jan 17, 2015·Science·Eduardo H da Silva NetoAndrea Damascelli
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Apr 4, 2018·Proceedings of the National Academy of Sciences of the United States of America·Mathias S ScheurerSubir Sachdev
Sep 14, 2018·Reports on Progress in Physics·Subir Sachdev

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