Optical-absorption edge of CsI up to 58 @Pa

J P Itic , A Polian (1) , J M Besson

1 IMPMC - Institut de minéralogie, de physique des matériaux et de cosmochimie

The optical transmittancy of cesium iodide single crystals has been studied up to 58 GPa, using xenon as a pressure-transmitting medium. The shape and position of the absorption edge under pressure has been measured under controlled stress-homogeneity conditions. It is found to differ significantly from previous results obtained on highly strained powder samples. The data are analyzed in terms of band-to-band transitions and show that band closing in cesium iodide is not to be expected below 90 GPa.

Domaines: Matière Condensée [cond-mat]

J P Itic, A Polian, J M Besson. Optical-absorption edge of CsI up to 58 @Pa. Physical Review B: Condensed Matter (1978-1997), 1984. ⟨hal-03085341⟩