Infrared optical excitations inLa2NiO4
| Autor: | J. D. Perkins, Marc Kastner, Yasuo Endoh, Robert J. Birgeneau, D. S. Kleinberg, Kohta Yamada, Syoichi Hosoya |
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| Rok vydání: | 1995 |
| Předmět: | |
| Zdroj: | Physical Review B. 52:R9863-R9866 |
| ISSN: | 1095-3795 0163-1829 |
| Popis: | Measurements are reported of the transmission of single crystals of ${\mathrm{La}}_{2}$${\mathrm{NiO}}_{4}$ containing no excess oxygen. Several weak absorption bands are observed in the range 0.15--2 eV arising from magnetic and crystal-field excitations. The lowest-energy band, at 0.25 eV, is quantitatively described by a recent theory for phonon-assisted creation of a virtual bound state of two magnons. However, unlike ${\mathrm{La}}_{2}$${\mathrm{CuO}}_{4}$, no higher-energy sidebands are detected, suggesting that the broad, structured absorption seen clearly in ${\mathrm{La}}_{2}$${\mathrm{CuO}}_{4}$ between \ensuremath{\sim}0.4 and 1 eV results from sidebands to crystal-field excitons as previously proposed. |
| Databáze: | OpenAIRE |
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