Evolution of a polaron band through the phase diagram of Nd[2-x]Ce[x]CuO[4-y]

Details Evolution of a polaron band through the phase diagram of Nd[2-x]Ce[x]CuO[4-y] Evolution of a polaron band through the phase diagram of Nd[2-x]Ce[x]CuO[4-y]

1999-10-07

arxiv.org/abs/cond-mat/9910102v2

Physics

Condensed Matter

Superconductivity

Text in apstex + 3 figures epsf. Typos corrected. To appear on Phys. Rev. Lett. Sub-j class: Superconductivity

Scientific paper

10.1103/PhysRevLett.83.4852

The evolution with doping and temperature of the polaronic absorption in a family of high-T$_c$ superconductors is first followed here across the whole phase diagram. The polaron band softens with increasing doping, is still present in the superconducting phase, and vanishes in the overdoped metallic phase. These results point toward the existence of polaron aggregates at low temperature and may provide an experimental ground for the increasing number of theoretical descriptions of many-polaron systems.

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