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Phys. Rev. Lett. 89, 107003 (2002) [4 pages]

Observation of an Unconventional Metal-Insulator Transition in Overdoped CuO2 Compounds

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F. Venturini1, M. Opel1, T. P. Devereaux2, J. K. Freericks3, I. Tüttő4, B. Revaz5, E. Walker5, H. Berger6, L. Forró6, and R. Hackl1
1Walther Meissner Institute, Bavarian Academy of Sciences, 85748 Garching, Germany
2Department of Physics, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
3Department of Physics, Georgetown University, Washington, D.C. 20057
4RISPO, Hungarian Academy of Sciences, P.O.Box 49, 1525 Budapest, Hungary
5DPMC, University of Geneva, 1121 Genève, Switzerland
6EPFL, Ecublens, 1025 Lausanne, Switzerland

Received 26 April 2002; published 19 August 2002

The electron dynamics in the normal state of Bi2Sr2CaCu2O8+δ is studied by inelastic light scattering over a wide range of doping. A strong anisotropy of the electron relaxation is found which cannot be explained by single-particle properties alone. The results strongly indicate the presence of an unconventional quantum-critical metal-insulator transition where “hot” (antinodal) quasiparticles become insulating while “cold” (nodal) quasiparticles remain metallic. A phenomenology is developed which allows a quantitative understanding of the Raman results and provides a scenario which links single- and many-particle properties.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.107003
DOI:
10.1103/PhysRevLett.89.107003
PACS:
74.72.–h, 71.30.+h, 78.30.–j
 
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