Angle-Resolved Photoemission Spectroscopy of (Ca,Na)2CuO2Cl2Crystals: Fingerprints of a Magnetic Insulator in a Heavily Underdoped Superconductor
- 15 May 2003
- journal article
- Published by Physical Society of Japan in Journal of the Physics Society Japan
- Vol. 72 (5) , 1018-1021
- https://doi.org/10.1143/jpsj.72.1018
Abstract
Electronic evolution from an antiferromagnet to a high-Tc superconductor is revealed by angle-resolved photoemission experiments on tetragonal Ca(1.9)Na(0.1)CuO(2)Cl(2) 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 pseudo-gap. 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 La(2-x)Sr(x)CuO(4), demonstrating that the route to a high-Tc superconductor is not unique.Comment: 4 pages, 4 figureKeywords
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