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Phys. Rev. Lett. 93, 267002 (2004) [4 pages]

Missing Quasiparticles and the Chemical Potential Puzzle in the Doping Evolution of the Cuprate Superconductors

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K. M. Shen1, F. Ronning1,*, D. H. Lu1, W. S. Lee1, N. J. C. Ingle1, W. Meevasana1, F. Baumberger1, A. Damascelli1,†, N. P. Armitage1,‡, L. L. Miller2, Y. Kohsaka3, M. Azuma4, M. Takano4, H. Takagi3, and Z.-X. Shen1
1Departments of Applied Physics, Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA
2Department of Chemistry, University of Oregon, Eugene, Oregon 97403, USA
3Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
4Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan

Received 19 May 2004; published 20 December 2004

The evolution of Ca2-xNaxCuO2Cl2 from Mott insulator to superconductor was studied using angle-resolved photoemission spectroscopy. By measuring both the excitations near the Fermi energy as well as nonbonding states, we tracked the doping dependence of the electronic structure and the chemical potential with unprecedented precision. Our work reveals failures in the standard weakly interacting quasiparticle scenario, including the broad line shapes of the insulator and the apparently paradoxical shift of the chemical potential within the Mott gap. To resolve this, we develop a model where the quasiparticle is vanishingly small at half filling and grows upon doping, allowing us to unify properties such as the dispersion and Fermi wave vector with the chemical potential.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.267002
DOI:
10.1103/PhysRevLett.93.267002
PACS:
74.25.Jb, 74.72.Jt, 79.60.–i

*Present address: Los Alamos National Laboratory, Los Alamos, NM 87545, USA.

†Present address: Department of Physics and Astronomy, University of British Columbia, Vancouver, B.C., Canada, V6T 1Z1.

‡Present address: Department of Physics and Astronomy, University of CA, Los Angeles, Los Angeles, CA 90095, USA.

 
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