Abstract
Electronic evolution from an antiferromagnetic insulator to a high-Tc superconductor is revealed by angle-resolved photoemission spectroscopy experiments on tetragonal Ca2−xNaxCuO2Cl2 single crystals, which were grown for the first time under high pressures (⩽5.5 GPa). In an underdoped superconductor (x=0.1), we found clear fingerprints of the parent magnetic insulator: a shadow band and a large gap-like structure. The results are most likely described by a “chemical potential shift”, which contrasts clearly with the “pinned chemical potential” reported for the prototype La2−xSrxCuO4, demonstrating that the route to a high-Tc superconductor is not unique.
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