期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 72, 期 5, 页码 1018-1021出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.72.1018
关键词
ARPES; (Ca,Na)(2)CuO2Cl2; electronic evolution; electronic structure
Electronic evolution from an antiferromagnet to a high-T-c superconductor is revealed by angle-resolved photoemission experiments on tetragonal Ca1.9Na0.1CuO2Cl2 single crystals, which were successfully grown for the first time under high pressures. In this underdoped superconductor, we found clear fingerprints of the parent insulator: a shadow band and a large pseudogap. These observations are most likely described by a chemical potential shift, which contrasts clearly with the prevailing wisdom of the pinned chemical potential learned from the prototype La2-xSrxCuO4, demonstrating that the route to a high-T-c superconductor is not unique.
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