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Temperature and Field Dependence of Exciton‐Magnon Absorption of NaMnCl 3
Author(s) -
Popov E. A.,
Kotlyarskii M. M.,
Edelman I. S.
Publication year - 1985
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.2221320217
Subject(s) - exciton , magnon , condensed matter physics , annihilation , absorption (acoustics) , physics , magnetic field , absorption band , absorption spectroscopy , atomic physics , chemistry , ferromagnetism , optics , nuclear physics , quantum mechanics
The behaviour of the optical absorption bands of NaMnCl 3 , is experimentally studied in the region of the 6 Alg → 4 A lg , 4 E g ( 4 G) transition of the Mn 2+ ion in the temperature range 1.8 to 20 K and in magnetic fields up to 20 T. Exciton and its “hot” magnon sidebands are observed in the spectrum. The anomalous temperature dependence of the exciton‐magnon bands intensity is explained by participation of magnons with wave vector k ± o in absorption. The low energy exciton‐mag‐ non band is supposed to be due to simultaneous creation of an exciton and annihilation of three thermally created magnons.