Evolution of a polaron band through the phase diagram of Nd[2-x]Ce[x]CuO[4-y]
S. Lupi, P. Maselli, M. Capizzi, P. Calvani, P. Giura, P. Roy
Abstract
The evolution with doping and temperature of the polaronic absorption in a family of high-Tc 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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