Observation of small Fermi pockets protected by clean CuO2 sheets of a high-Tc superconductor

被引：37

作者：

Kunisada, So ^{[1
]}

Isono, Shunsuke ^{[2
]}

Kohama, Yoshimitsu ^{[1
,3
]}

Sakai, Shiro ^{[4
]}

Bareille, Cedric ^{[1
]}

Sakuragi, Shunsuke ^{[1
]}

Noguchi, Ryo ^{[1
]}

Kurokawa, Kifu ^{[1
]}

Kuroda, Kenta ^{[1
]}

Ishida, Yukiaki ^{[1
]}

Adachi, Shintaro ^{[5
]}

Sekine, Ryotaro ^{[2
]}

Kim, Timur K. ^{[6
]}

Cacho, Cephise ^{[6
]}

Shin, Shik ^{[1
,7
]}

Tohyama, Takami ^{[8
]}

Tokiwa, Kazuyasu ^{[2
]}

Kondo, Takeshi ^{[1
,3
]}

机构：

[1] Univ Tokyo, ISSP, Kashiwa, Chiba 2778581, Japan

[2] Tokyo Univ Sci, Dept Appl Elect, Tokyo 1258585, Japan

[3] Univ Tokyo, Trans Scale Quantum Sci Inst, Bunkyo Ku, Tokyo 1130033, Japan

[4] RIKEN Ctr Emergent Matter Sci CEMS, Wako, Saitama 3510198, Japan

[5] Natl Inst Mat Sci, MANA, Tsukuba, Ibaraki 3050047, Japan

[6] Diamond Light Source, Harwell Campus, Didcot OX11 0DE, Oxon, England

[7] Univ Tokyo, Off Univ Prof, Kashiwa, Chiba 2778568, Japan

[8] Tokyo Univ Sci, Dept Appl Phys, Tokyo 1258585, Japan

来源：

SCIENCE | 2020年 / 369卷 / 6505期

关键词：

PULSED MAGNETIC-FIELDS; QUANTUM OSCILLATIONS; SURFACE; COEXISTENCE; COMPETITION; ORDER; MODEL; GAP;

D O I：

10.1126/science.aay7311

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 cuprate superconductors with high critical transition temperature (T-c), light hole-doping to the parent compound, which is an antiferromagnetic Mott insulator, has been predicted to lead to the formation of small Fermi pockets. These pockets, however, have not been observed. Here, we investigate the electronic structure of the five-layered Ba2Ca4Cu5O10(F,O)(2), which has inner copper oxide (CuO2) planes with extremely low disorder, and find small Fermi pockets centered at (pi/2, pi/2) of the Brillouin zone by angle-resolved photoemission spectroscopy and quantum oscillation measurements. The d-wave superconducting gap opens along the pocket, revealing the coexistence between superconductivity and antiferromagnetic ordering in the same CuO2 sheet. These data further indicate that superconductivity can occur without contribution from the antinodal region around (pi, 0), which is shared by other competing excitations.

引用

页码：833 / +

页数：29