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Study of energy transfer from 3d to 4f electrons in antiferromagnetic MnF 2 : Eu 3+ crystals
Author(s) -
Eremenko V. V.,
Matyushkin E. V.,
Petrov S. V.
Publication year - 1966
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.19660180220
Subject(s) - antiferromagnetism , excited state , luminescence , ion , atmospheric temperature range , atomic physics , intensity (physics) , electron , condensed matter physics , range (aeronautics) , materials science , chemistry , physics , optics , organic chemistry , meteorology , optoelectronics , quantum mechanics , composite material
The spectrum and luminescence intensity of the antiferromagnetic crystals MnF 2 :Eu 3+ are investigated experimentally for temperatures between 20 and 90 °K. This range includes the magnetic ordering temperature T N (≈ 68 °K). At the temperature T H (≈ 0,5 T N ), corresponding to the spin ordering of the excited Mn 2+ ions, the luminescence intensity due to these ions shows a sudden increase while the luminescence intensity due to the Eu 3+ ions suffers a sudden decrease. This indicates that an anomalous change occurs in the transfer of energy between the Mn 2+ and Eu 2+ ions due to the condensation of the local magnetic vibrations of the optically excited Mn 2+ ions.