Correlating the charge-transfer gap to the maximum transition temperature in Bi2Sr2Can-1CunO2n+4+δ

• 成果类型: Article
• 署名作者: Wang, Zechao; Zou, Changwei; Lin, Chengtian; Luo, Xiangyu; Yan, Hongtao; Yin, Chaohui; Xu, Yong; Zhou, Xingjiang; Wang, Yayu; Zhu, Jing
• 署名单位: Tsinghua University; Ji Hua Laboratory; Tsinghua University; Tsinghua University; Max Planck Society; Chinese Academy of Sciences; Institute of Physics, CAS; RIKEN
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-11284
• DOI: 10.1126/science.add3672
• 发表日期: 2023-07-14
• 页码: 227-+
• 关键词: mott insulator; superconductivity; EVOLUTION; physics; axis

摘要

As the number of CuO2 layers, n, in each unit cell of a cuprate family increases, the maximum transition temperature (T-c,T-max) exhibits a universal bell-shaped curve with a peak at n = 3. The microscopic mechanism of this trend remains elusive. In this study, we used advanced electron microscopy to image the atomic structure of cuprates in the Bi2Sr2Can-1CunO2n+4+delta family with 1 <= n <= 9; the evolution of the charge-transfer gap size (Delta) with n can be measured simultaneously. We determined that the n dependence of Delta follows an inverted bell-shaped curve with the minimum Delta value at n = 3. The correlation between Delta, n, and T-c,T-max may clarify the origin of superconductivity in cuprates.