High Temperature Superconductivity Dominated by Inner Underdoped CuO2 Planes in Quadruple-Layer Cuprate (Cu,C)Ba2Ca3Cu4O11+δ
Using angle-resolved photoemission spectroscopy on the high-Tc quadruple-layer cuprate (Cu,C)Ba2Ca3Cu4O11+δ, this study reveals that superconductivity is driven primarily by underdoped inner CuO2 planes rather than a composite effect involving outer planes, demonstrating that high transition temperatures can be achieved even in apical-oxygen-free, deeply underdoped layers.
Xingtian Sun, Suppanut Sangphet, Nan Guo, Yu Fan, Yutong Chen, Minyinan Lei, Xue Ming, Xiyu Zhu, Hai-Hu Wen, Haichao Xu, Rui Peng, Donglai Feng2026-05-11🔬 cond-mat