High-pressure effects on the optical-absorption edge of CdIn2S4, MgIn2S4, and MnIn2S4 thiospinels
| Autor: | Ruiz-Fuertes, J., Errandonea, D., Manjon, F. J., Martinez-Garcia, D., Segura, A., Ursaki, V. V., Tiginyanu, I. M. |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | J. Appl. Phys. 103, 063710 (2008) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/1.2887992 |
| Popis: | The effect of pressure on the optical-absorption edge of CdIn2S4, MgIn2S4, and MnIn2S4 thiospinels at room temperature is investigated up to 20 GPa. The pressure dependence of their band-gaps has been analyzed using the Urbach rule. We have found that, within the pressure-range of stability of the low-pressure spinel phase, the band-gap of CdIn2S4 and MgIn2S4 exhibits a linear blue-shift with pressure, whereas the band-gap of MnIn2S4 exhibits a pronounced non-linear shift. In addition, an abrupt decrease of the band-gap energies occurs in the three compounds at pressures of 10 GPa, 8.5 GPa, and 7.2 GPa, respectively. Beyond these pressures, the optical-absorption edge red-shifts upon compression for the three studied thiospinels. All these results are discussed in terms of the electronic structure of each compound and their reported structural changes. Comment: 18 pages, 3 figures |
| Databáze: | arXiv |
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