Common origin of the pseudogap in electron-doped and hole-doped cuprates governed by Mott physics

M. Horio, S. Sakai, K. Koshiishi, Y. Nonaka, H. Suzuki, J. Xu, M. Hashimoto, D. Lu, Z.-X. Shen, T. Ohgi, T. Konno, T. Adachi, Y. Koike, M. Imada and A. Fujimori

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Mar 08, 2019
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Received Date: 19th February 19

The pseudogap phenomena have been a long-standing mystery of the cuprate high-temperature superconductors. Unlike the pseudogap in hole-doped cuprates, however, the pseudogap in the electron-doped counterpart has been attributed to band folding due to short-range antiferromagnetic (AFM) order. We performed angle-resolved photoemission spectroscopy measurements on electron-doped cuprates showing spin-glass and disordered AFM behaviors at low temperatures, and found that the gap magnitude decreases in the antinodal region contrary to the hole-doped case. Moreover, the spectra do not always show band folding at the AFM Brillouin zone boundary in contradiction with the requirement of the AFM band-folding picture. These features are consistent with cluster dynamical-mean-field-theory calculations which predict an s-symmetry pseudogap that shrinks in the andinodal region. The present results support the scenario that the proximity to the Mott insulator, without relying on the well-developed AFM correlation, gives rise to a momentum-dependent pseudogap of s-symmetry with indirect gap commonly in the electron-doped and hole-doped cuprates, implying a universal origin of the pseudogap with a similarity to the Mott gap formation.

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