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RESEARCH PRODUCT
Optical Absorption of Zinc Selenide Doped with Cobalt (Zn1-xCoxSe) under Hydrostatic Pressure
V. MuñozCh. Ferrer-rocaAlfredo Segurasubject
chemistry.chemical_compoundAbsorption spectroscopyAbsorption edgeChemistryHydrostatic pressureDopingAnalytical chemistryZinc selenideMagnetic semiconductorCondensed Matter PhysicsAbsorption (electromagnetic radiation)Diamond anvil cellElectronic Optical and Magnetic Materialsdescription
Optical absorption of the diluted magnetic semiconductor Zn 1-x Co x Se (x = 0.02) has been measured at room temperature under hydrostatic pressure up to 14 GPa in a membrane diamond-anvil cell. We found two absorption features: (i) an absorption structure in the energy range 1.5 to 1.8 eV, with a negligible pressure shift (i.e. (0.45 ± 0.05) meV/GPa) which we have identified as the Co 2+ (3d 7 ) internal transition 4 A 2 (F) → 4 T 1 (P) and (ii) an onset in the energy range 2 to 2.7 eV which redshifts with pressure (dE/dP = (-8.1 ± 0.6) meV/GPa). We have attributed such absorption edge to charge transfer between the ZnSe valence band and the Co 2+ (3d 7 ) levels. On the assumption that those levels are absolute energy references, a valence band deformation potential of (-0.8 ± 0.07) eV has been derived.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-08-01 | physica status solidi (a) |