Temperature Dependent Oscillator Strengths of Optical Absorptions in MnF_2 and RbMnF_3
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概要
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Temperature dependent absorption strength of several absorption bands of MnF_2 and RbMnF_3 in visible and ultra-violet region is investgated experimentally and theoretically. The oscillator strength for the exciton-magnon trandiriond increases as temperature increases up to Neel temperature T_N or even above T_N, and saturates or varies only slightly at higher temperatures. It is found, however, that the temperature dependence of the cold band intensity below T_N is quite different from this as this as expected from the theory. The temperature variation of the two-exciton transitions is somewhat similar of that of the intensity starts to decrease with the increase of T below T_N and is nearly constant or increases slightly above T_N. Theoretical explanations for these exprimental results are presented. The calculation which assumes inter- and intrasublattice pair excitation leads to the results in qualitative agreement with the experiment. Causes of quantitative discrepancy are also discussed.
- 社団法人日本物理学会の論文
- 1972-07-05
著者
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Fujiwara Takeo
Department Of Applied Physics The University Of Tokyo
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Fujiwara Takeo
Department Of Applied Physics Faculty Of Engineereing University Of Tokyo
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TANABE Yukito
Department of Applied Physics,Faculty of Engineering,The University of Tokyo
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Tanabe Yukito
Department Of Applied Physics University Of Tokyo
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Tanabe Yukito
Department Of Applied Physics Faculty Of Engineering The University Of Tokyo
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Gebhardt Wolfgang
Fachbereich Physik Universitat Regensburg Regensburg
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PETANIDES Kaisar
Fachbereich Physik, Universitat Regensburg, Regensburg
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Petanides Kaisar
Fachbereich Physik Universitat Regensburg Regensburg
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