2020年8月14日
Observation of small Fermi pockets protected by clean CuO2 sheets of a high-Tc superconductor
Science
- 巻
- 369
- 号
- 6505
- 開始ページ
- 833
- 終了ページ
- 838
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1126/science.aay7311
<jats:p>In cuprate superconductors with high critical transition temperature (<jats:italic>T</jats:italic><jats:sub>c</jats:sub>), 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 Ba<jats:sub>2</jats:sub>Ca<jats:sub>4</jats:sub>Cu<jats:sub>5</jats:sub>O<jats:sub>10</jats:sub>(F,O)<jats:sub>2</jats:sub>, which has inner copper oxide (CuO<jats:sub>2</jats:sub>) planes with extremely low disorder, and find small Fermi pockets centered at (π/2, π/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 CuO<jats:sub>2</jats:sub> sheet. These data further indicate that superconductivity can occur without contribution from the antinodal region around (π, 0), which is shared by other competing excitations.</jats:p>
- ID情報
-
- DOI : 10.1126/science.aay7311
- ISSN : 1095-9203
- ORCIDのPut Code : 78973865
- PubMed ID : 32792396