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Magneto‐Optical Investigation of Antiferromagnets (Manganese and cobalt carbonates and fluorides)
Author(s) -
Eremenko V. V.,
Popkov Yu. A.
Publication year - 1965
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.19650120211
Subject(s) - antiferromagnetism , zeeman effect , manganese , chemistry , condensed matter physics , absorption (acoustics) , magnetic field , field (mathematics) , ion , absorption spectroscopy , spin (aerodynamics) , cobalt , crystallography , materials science , inorganic chemistry , physics , optics , mathematics , organic chemistry , quantum mechanics , pure mathematics , composite material , thermodynamics
An experimental study is made of the effect of high magnetic fields on the structure of the optical absorption spectra of Mn 2+ and Co 2+ . The study uses single crystals of antiferromagnetic fluorides and carbonates of the ions and also single crystals of fluorides of mixed content, containing both ions simultaneously. The investigations are carried out at 20.4 and 4.2 °K, which is significantly lower than the temperature of antiferromagnetic ordering ( T N ). Magnetic fields of up to 1.7 · 10 5 Oe are used. The magneto‐optical effects found in the fluorides are connected with spin‐flipping of the magnetic sublattices by the external field. This may be due to a significant spin‐orbital exchange in states (the final states for the optical transitions responsible for the absorption bands) which respond to the re‐establishment of the antiferromagnetic structure by the external field. Zeeman splitting and shift of some absorption lines is observed in antiferromagnetic carbonates in which the magnetic structure cannot be changed by the external field. This is accounted for on the basis that the internal field H E , perpendicular to the C 3 ‐axis of the crystal, effects some excited states of Mn 2+ and Co 2+ significantly less than the external field H parallel to C 3 ‐axis although H ≪ H E .