Suppression of the antiferromagnetic pseudogap in the electron-doped high-temperature superconductor by protect annealing

M. Horio (), T. Adachi, Y. Mori, A. Takahashi, T. Yoshida, H. Suzuki, L. C. C. Ambolode, K. Okazaki, K. Ono, H. Kumigashira, H. Anzai, M. Arita, H. Namatame, M. Taniguchi, D. Ootsuki, K. Sawada, M. Takahashi, T. Mizokawa, Y. Koike and A. Fujimori
Additional contact information
M. Horio: University of Tokyo
T. Adachi: Sophia University
Y. Mori: Tohoku University
A. Takahashi: Tohoku University
T. Yoshida: University of Tokyo
H. Suzuki: University of Tokyo
L. C. C. Ambolode: University of Tokyo
K. Okazaki: University of Tokyo
K. Ono: KEK, Photon Factory
H. Kumigashira: KEK, Photon Factory
H. Anzai: Hiroshima Synchrotron Radiation Center, Hiroshima University
M. Arita: Hiroshima Synchrotron Radiation Center, Hiroshima University
H. Namatame: Hiroshima Synchrotron Radiation Center, Hiroshima University
M. Taniguchi: Hiroshima Synchrotron Radiation Center, Hiroshima University
D. Ootsuki: University of Tokyo
K. Sawada: Graduate School of Frontier Sciences, University of Tokyo
M. Takahashi: University of Tokyo
T. Mizokawa: Graduate School of Frontier Sciences, University of Tokyo
Y. Koike: Tohoku University
A. Fujimori: University of Tokyo

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract In the hole-doped cuprates, a small number of carriers suppresses antiferromagnetism and induces superconductivity. In the electron-doped cuprates, on the other hand, superconductivity appears only in a narrow window of high-doped Ce concentration after reduction annealing, and strong antiferromagnetic correlation persists in the superconducting phase. Recently, Pr1.3−xLa0.7CexCuO4 (PLCCO) bulk single crystals annealed by a protect annealing method showed a high critical temperature of around 27 K for small Ce content down to 0.05. Here, by angle-resolved photoemission spectroscopy measurements of PLCCO crystals, we observed a sharp quasi-particle peak on the entire Fermi surface without signature of an antiferromagnetic pseudogap unlike all the previous work, indicating a dramatic reduction of antiferromagnetic correlation length and/or of magnetic moments. The superconducting state was found to extend over a wide electron concentration range. The present results fundamentally challenge the long-standing picture on the electronic structure in the electron-doped regime.

Date: 2016
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DOI: 10.1038/ncomms10567

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