Optical Properties of α-TiCl3 at the Magnetic Transition Temperature

✍ Scribed by F. Cavallone; I. Pollini; G. Spinolo

• Publisher: John Wiley and Sons
• Year: 1971
• Tongue: English
• Weight: 374 KB
• Volume: 45
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/pssb.2220450204

✦ Synopsis

Abstract

Careful optical absorption measurements of α‐TiCl~3~ crystals in the energy range 1.2 to 4.2 eV, at various temperatures (down to 4.2 °K), have revealed a noticeable change both in the crystal field and charge transfer spectrum, around T~t~ = 217 °K. The results found in the crystal field region (1.2 to 2.10eV) have been explained taking into account both the trigonal perturbation of the crystal field and the Jahn‐Teller effect of the electronic energy levels. The charge transfer spectrum (2.10 to 4.2 eV) seems to be more influenced by the lattice parameter discontinuity present at T~t~ rather than by the magnetic order below T~N~ = 265 °K. Reflectivity measurements in the energy range 1.20 to 5.50 eV, at 300 and 55 °K are also reported. A discussion of the electronic transitions with relations for the optical properties in the energy region from 2.1 to 5.5 eV is given.