Small and large polarons in nickelates, manganites, and cuprates

Details Small and large polarons in nickelates, manganites, and cuprates Small and large polarons in nickelates, manganites, and cuprates

1997-02-21

arxiv.org/abs/cond-mat/9702194v1

Physics

Condensed Matter

Superconductivity

File latex, 15 p. incl. 4 Figs. epsf, to appear on the Journal of Superconductivity - Proc. "Stripes 1996" - Roma Dec 1996

Scientific paper

10.1007/BF02765706

By comparing the optical conductivities of La_{1.67}Sr_{0.33}NiO_{4} (LSNO), Sr_{1.5}La_{0.5}MnO_4 (SLMO), Nd_2CuO_{4-y} (NCO), and Nd_{1.96}Ce_{0.04}CuO_{4} (NCCO), we have identified a peculiar behavior of polarons in this cuprate family. While in LSNO and SLMO small polarons localize into ordered structures below a transition temperature, in those cuprates the polarons appear to be large, and at low T their binding energy decreases. This reflects into an increase of the polaron radius, which may trigger coherent transport.

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