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Magneto‐Optical Measurements on Two‐Dimensional Magnetic Model Systems
Author(s) -
Arend H.,
Von Känel H.,
Wachter P.
Publication year - 1976
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.2220740115
Subject(s) - zeeman effect , absorption (acoustics) , ion , chemistry , condensed matter physics , absorption spectroscopy , magnetic field , spin (aerodynamics) , crystal (programming language) , range (aeronautics) , blueshift , line (geometry) , atmospheric temperature range , spectral line , atomic physics , physics , materials science , optics , thermodynamics , quantum mechanics , organic chemistry , computer science , composite material , photoluminescence , programming language , geometry , mathematics
Abstract The optical absorption of the two‐dimensional antiferromagnets (CH 3 NH 3 ) 2 MnCl 4 and (C 2 H 5 NH 3 )MnCl 4 has been measured between 0.5 and 5.4 eV in the temperature range 4.2 to 300 K. An absorption maximum at 4.96 eV which only appears at low temperatures is proposed to originate from an inter‐3d transition between antiferromagnetically aligned Mn ions. The temperature variation of the absorption power of this maximum follows the spin correlation function for the two‐dimensional Heisenberg antiferrormagnet. Furthermore the energy of one of the intra‐3d transitions is determined as a function of temperature. However, a separation of the spectral shift of the absorption line into a Zeeman‐ and a crystal field component is not unambiguous.