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, Takashi Mizokawa, Y. Koike, A. Fujimori

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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.

Original languageEnglish
Article number10567
JournalNature Communications
Volume7
DOIs
Publication statusPublished - 2016 Feb 4
Externally publishedYes

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ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Chemistry(all)
  • Physics and Astronomy(all)

Cite this

Horio, M., Adachi, T., Mori, Y., Takahashi, A., Yoshida, T., Suzuki, H., Ambolode, L. C. C., Okazaki, K., Ono, K., Kumigashira, H., Anzai, H., Arita, M., Namatame, H., Taniguchi, M., Ootsuki, D., Sawada, K., Takahashi, M., Mizokawa, T., Koike, Y., & Fujimori, A. (2016). Suppression of the antiferromagnetic pseudogap in the electron-doped high-temperature superconductor by protect annealing. Nature Communications, 7, [10567]. https://doi.org/10.1038/ncomms10567