Polaronic optical absorption in electron-doped and hole-doped cuprates

P. Calvani; M. Capizzi; S. Lupi; P. Maselli; A. Paolone; P. Roy

doi:10.1103/PhysRevB.53.2756

paper

Polaronic optical absorption in electron-doped and hole-doped cuprates

arXiv:supr-con/9510002 · doi:10.1103/PhysRevB.53.2756

Abstract

Polaronic features similar to those previously observed in the photoinduced spectra of cuprates have been detected in the reflectivity spectra of chemically doped parent compounds of high-critical-temperature superconductors, both $n$ -type and $p$ -type. In Nd $_{2}$ CuO $_{4 - y}$ these features, whose intensities depend both on doping and temperature, include local vibrational modes in the far infrared and a broad band centered at $\sim$ 1000 cm $^{- 1}$ . The latter band is produced by the overtones of two (or three) local modes and is well described in terms of a small-polaron model, with a binding energy of about 500 cm $^{- 1}$ . Most of the above infrared features are shown to survive in the metallic phase of Nd $_{2 - x}$ Ce $_{x}$ Cu0 $_{4 - y}$ , Bi $_{2}$ Sr $_{2}$ CuO $_{6}$ , and YBa $_{2}$ Cu $_{3}$ O $_{7 - y}$ , where they appear as extra-Drude peaks. The occurrence of polarons is attributed to local modes strongly coupled to carriers, as shown by a comparison with tunneling results.

arXiv commentFile latex, 31 p., submitted to Physical Review B. Figures may be faxed upon request

Polaronic optical absorption in electron-doped and hole-doped cuprates

Abstract

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