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The magneto‐optic Kerr effect and Faraday rotation of CdCr 2 S 4 for radiation between 0.1 and 4 eV
Author(s) -
Wittekoek S.,
Rinzema G.
Publication year - 1971
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220440245
Subject(s) - faraday effect , condensed matter physics , crystal (programming language) , chemistry , polar , infrared , atomic physics , physics , magnetic field , optics , quantum mechanics , astronomy , computer science , programming language
The complex polar Kerr effect (rotation and ellipticity) of CdCr 2 S 4 has been measured between 1.6 and 4 eV at temperatures between T c = 84 and 6 °K. Four well separated magneto‐optical transitions have been identified. Two sharp peaks at 2.12 and 2.29 eV are attributed to the Cr 3+ crystal field transitions 4A 2 → 2 T 2 and 4 A 2 → 4 T 1 , respectively. Crystal field parameters satisfying the optical data have been derived. Only one transition at 1.9 eV shows a magnetic red‐shift. It depends on sample‐stoichiometry and doping. The strongest resonance is found at 3.4 eV and is assigned to a charge transfer transition of an electron from a p‐orbital of sulphur to a chromium orbital. The Faraday rotation in the infrared region is also reported and shown to be caused by the charge transfer transition at 3.4 eV.