dorsal/arxiv
View SchemaPolaronic optical absorption in electron-doped and hole-doped cuprates
| Authors | P. Calvani, M. Capizzi, S. Lupi, P. Maselli, A. Paolone, P. Roy |
|---|---|
| Categories | |
| ArXiv ID | supr-con/9510002 |
| URL | https://arxiv.org/abs/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.
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"abstract": "Polaronic features similar to those previously observed in the photoinduced\nspectra of cuprates have been detected in the reflectivity spectra of\nchemically doped parent compounds of high-critical-temperature superconductors,\nboth $n$-type and $p$-type. In Nd$_2$CuO$_{4-y}$ these features, whose\nintensities depend both on doping and temperature, include local vibrational\nmodes in the far infrared and a broad band centered at $\\sim$ 1000 cm$^{-1}$.\nThe latter band is produced by the overtones of two (or three) local modes and\nis well described in terms of a small-polaron model, with a binding energy of\nabout 500 cm$^{-1}$. Most of the above infrared features are shown to survive\nin the metallic phase of Nd$_{2-x}$Ce$_x$Cu0$_{4-y}$, Bi$_2$Sr$_2$CuO$_6$, and\nYBa$_2$Cu$_3$O$_{7-y}$, where they appear as extra-Drude peaks. The occurrence\nof polarons is attributed to local modes strongly coupled to carriers, as shown\nby a comparison with tunneling results.",
"arxiv_id": "supr-con/9510002",
"authors": [
"P. Calvani",
"M. Capizzi",
"S. Lupi",
"P. Maselli",
"A. Paolone",
"P. Roy"
],
"categories": [
"supr-con",
"cond-mat.supr-con"
],
"doi": "10.1103/PhysRevB.53.2756",
"title": "Polaronic optical absorption in electron-doped and hole-doped cuprates",
"url": "https://arxiv.org/abs/supr-con/9510002"
},
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