Photoinduced Spin Disorder in Half-Metal CrO2 films
WU Xue-Wei, NIU Dong-Lin, LIU Xiao-Jun
Key Laboratory of Modern Acoustics, Department of Electronic Science and Engineering, Nanjing University, Nanjing 210093
Photoinduced Spin Disorder in Half-Metal CrO2 films
WU Xue-Wei;NIU Dong-Lin;LIU Xiao-Jun
Key Laboratory of Modern Acoustics, Department of Electronic Science and Engineering, Nanjing University, Nanjing 210093
关键词 ：
74.62.Dh ,
71.30.+h ,
72.80.Ga
Abstract ： We investigate the photoinduced effects on the spin state for half-metallic ferromagnet CrO2 (TC ～390K), in which the conducting electrons are totally polarized, by means of the time-resolved pump--probe method at the temperature range from 300K to 470K. A significant negative change ΔT/T for the transmittance spectrum at 1.55eV under photo-excitation is found. The ΔT/T value monotonically decreases on approaching to TC from the low temperature side, suggesting a photoinduced spin disorder state. Furthermore, we calculate the saturation magnetization MS of CrO2 in both the ground and photo-excited states by using the local-spin-density approximation plus U (LSDA+U) method, and find a decrease of the MS -value in the photo-excited state. The suppressed MS -value in the photo-excited state is consistent with the experimental data.
Key words ：
74.62.Dh
71.30.+h
72.80.Ga
出版日期: 2006-11-01
:
74.62.Dh
(Effects of crystal defects, doping and substitution)
71.30.+h
(Metal-insulator transitions and other electronic transitions)
72.80.Ga
(Transition-metal compounds)
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2006, Vol. 23 
