Details

Autor(en) / Beteiligte

• Tarasov, G.G
• Mazur, Yu.I
• Hoerstel, W
• Masselink, W.T

Titel

Manganese concentration effect on the lattice dynamics in multinary spin doped semiconductors

Ist Teil von

• Journal of alloys and compounds, 2004-05, Vol.371 (1-2), p.58-62

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2004

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• The vibration states of diluted magnetic narrow-gap Hg1−x−yCdxMnyTe (x=0–0.34, y=0–0.04) semiconductors are studied by means of far infrared reflection. The comparison of spectral features common for Hg1−x−yCdxMnyTe and Hg1−xCdxTe single crystals demonstrates the substantial effect of magnetic doping on the optical spectra, providing indirect evidence of improved crystal structure in quaternary compounds. The inherent fundamental phonon modes of Hg1−xCdxTe become significantly narrower in Hg1−x−yCdxMnyTe whereas the defect and some cluster modes are of much lower intensity. These modifications of the lattice dynamics are assumed to be caused by a manganese concentration effect on the relaxation of crystalline defects. For Hg1−x−yCdxMnyTe single crystals this concentration is found to be within 0.01<y<0.025. The particular mechanisms of the manganese-assisted relaxation of crystal structure in quaternary narrow-gap compounds are not yet completely clear.