The Jahn-Teller Center in Cadmium Halide Crystals-1-CdCl2:CuCl2

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  • The Jahn-Teller Center in Cadmium Halide Crystals(I)-CdCl2 :CuCl2-
  • Jahn Teller Center in Cadmium Halide Cr

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The ESR spectra of a Cu 2+ center in CdCl2 have been studied at about 35 K, at liquid nitrogen temperature and at room temperature. The Cu 2+ center in CdC12 is found to be composed of a central Cu 2+ ion and six nearest neighbor Cl- ions. The angular dependence of the spectra obtained at LNT will be explained in terms of the Jahn-Teller distortions, where the octahedron of Cl- ions around a Cu 2+ ion is elongated tetragonally. In addition, an axial distortion along the crystal c-axis was also observed at LNT. At 35 K, ten or thirteen sharp structures were observed at the high field part of the spectrum when the magnetic field was applied along or perpendicularly to tha axis joining Cu 2+ ion to one of the Cl- ions, respectively. These are associated with superhyperfine structures due to the magnetic interaction of the unpaired electron spin with two or four Clnuclei. At room temperature is observed a single broad ESR line with axial symmetry, which is interpreted in terms of the dynamical Jahn-Teller effect.

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