Radical–Triplet Pair Mechanism of Electron Spin Polarization. Detailed Theoretical Treatment

2014 ◽  
Vol 118 (48) ◽  
pp. 11355-11363 ◽  
Author(s):  
A. I. Shushin
Keyword(s):  
Spin Polarization ◽  
Electron Spin ◽  
Electron Spin Polarization ◽  
Theoretical Treatment ◽  
Triplet Pair

Electron Spin Polarization Transfer and Radical-Triplet Pair Polarization in Nitroxide−C60Derivative Systems

2001 ◽  
Vol 105 (48) ◽  
pp. 10776-10780 ◽  
Author(s):  
Elena Sartori ◽  
Antonio Toffoletti ◽  
Carlo Corvaja ◽  
Luigi Garlaschelli
Keyword(s):  
Spin Polarization ◽  
Electron Spin ◽  
Polarization Transfer ◽  
Electron Spin Polarization ◽  
Triplet Pair

Effects on the magnetic and optical properties of Co-doped ZnO at different electronic states

2017 ◽  
Vol 31 (31) ◽  
pp. 1750247
Author(s):  
Qingyu Huo ◽  
Zhenchao Xu ◽  
Linfeng Qu
Keyword(s):  
Absorption Spectrum ◽  
Spin Polarization ◽  
Electron Spin ◽  
Magnetic Moments ◽  
The State ◽  
Band Gaps ◽  
Electron Spin Polarization ◽  
Approximation Formula ◽  
Doped Zno ◽  
Co Doped

Both blue and red shifts in the absorption spectrum of Co-doped ZnO have been reported at a similar concentration range of doped Co. Moreover, the sources of magnetism of Co-doped ZnO are controversial. To solve these problems, the geometry optimization and energy of different Co-doped ZnO systems were calculated at the states of electron spin polarization and nonspin polarization by adopting plane-wave ultra-soft pseudopotential technology based on density function theory. At the state of electron nonspin polarization, the total energies increased as the concentration of Co-doped increased. The doped systems also became unstable. The formation energies increased and doping became difficult. Furthermore, the band gaps widened and the absorption spectrum exhibited a blue shift. The band gaps were corrected by local-density approximation + [Formula: see text] at the state of electron spin polarization. The magnetic moments of the doped systems weakened as the concentration of doped Co increased. The magnetic moments were derived from the coupling effects of [Formula: see text]–[Formula: see text]. The band gaps narrowed and the absorption spectrum exhibited a red shift. The inconsistencies of the band gaps and absorption spectrum at the states of electron spin polarization and nonspin polarization were first discovered in this research, and the sources of Co-doped ZnO magnetism were also reinterpreted.

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