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

被引：75

作者：

Horio, M. ^{[1
]}

Adachi, T. ^{[2
]}

Mori, Y. ^{[3
]}

Takahashi, A. ^{[3
]}

Yoshida, T. ^{[1
]}

Suzuki, H. ^{[1
]}

Ambolode, L. C. C., II ^{[1
]}

Okazaki, K. ^{[1
]}

Ono, K. ^{[4
]}

Kumigashira, H.

Anzai, H. ^{[5
,8
]}

Arita, M. ^{[5
]}

Namatame, H. ^{[5
]}

Taniguchi, M. ^{[5
,6
]}

Ootsuki, D. ^{[1
]}

Sawada, K. ^{[7
]}

Takahashi, M. ^{[1
]}

Mizokawa, T. ^{[7
]}

Koike, Y. ^{[3
]}

Fujimori, A. ^{[1
]}

机构：

[1] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan

[2] Sophia Univ, Dept Engn & Appl Sci, Tokyo 1028554, Japan

[3] Tohoku Univ, Dept Appl Phys, Sendai, Miyagi 9808579, Japan

[4] KEK, Photon Factory, Tsukuba, Ibaraki 3050801, Japan

[5] Hiroshima Univ, Hiroshima Synchrotron Radiat Ctr, Higashihiroshima 7390046, Japan

[6] Hiroshima Univ, Grad Sch Sci, Higashihiroshima 7398526, Japan

[7] Univ Tokyo, Grad Sch Frontier Sci, Kashiwa, Chiba 2770882, Japan

[8] Osaka Prefecture Univ, Grad Sch Engn, Sakai, Osaka 5998531, Japan

来源：

NATURE COMMUNICATIONS | 2016年 / 7卷

关键词：

SPIN CORRELATIONS; MAGNETIC ORDER; CUPRATE; ND2-XCEXCUO4+/-DELTA;

D O I：

10.1038/ncomms10567

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页数：8

共 46 条

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