Physics – Condensed Matter – Materials Science
Scientific paper
2007-11-23
J. Appl. Phys. 103, 063710 (2008)
Physics
Condensed Matter
Materials Science
18 pages, 3 figures
Scientific paper
10.1063/1.2887992
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.
Errandonea Daniel
Manjon F. J.
Martinez-Garcia D.
Ruiz-Fuertes Javier
Segura Antigona
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