Observation of an unconventional metal-insulator transition in overdoped CuO<sub>2</sub> compounds
|Title||Observation of an unconventional metal-insulator transition in overdoped CuO2 compounds|
|Publication Type||Journal Article|
|Year of Publication||2002|
|Authors||Venturini, F., Opel M., Devereaux T. P., Freericks J. K., Tutto I., Revaz B., Walker E., Berger H., Forro L., and Hackl R.|
|Journal||Physical Review Letters|
The electron dynamics in the normal state of Bi2Sr2CaCu2O8+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.