Observation of an unconventional metal-insulator transition in overdoped CuO_2 compounds

Details Observation of an unconventional metal-insulator transition in overdoped CuO_2 compounds Observation of an unconventional metal-insulator transition in overdoped CuO_2 compounds

2002-06-12

arxiv.org/abs/cond-mat/0206210v1

Phys. Rev. Lett. 89, 107003 (2002)

Physics

Condensed Matter

Superconductivity

4 pages, 3 gif figures

Scientific paper

10.1103/PhysRevLett.89.107003

The electron dynamics in the normal state of Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ 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.

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