Study Of Effects Of Magnon-exciton Interaction On Ferromagnetism Of Diluted Magnetic Semiconductors

In this thesis the e ect of exciton-magnon interaction on Diluted Magnetic Semiconduc-rntors (DMS) is theoretically studied employing quantum eld theory. The double timerntemperature Green function technique is used to nd dispersion whereby single modernmagnon number is obtained from spectral density calculations. It is understood that thernexistence of exciton and magnon coupling increases total number of magnons which isrnthe reason for decrease in magnetization leading to lowering of ferromagnetic transitionrntemperature Tc. This is perhaps due to scattering of orientations of introduced magneticrnspins. The disorder is attributed as enhanced by long time coupling of electron-hole pair,rnreducing number of holes that mediate ferromagnetism. At lower temperatures the impu-rnrity concentration, x and Tc direct relation is known to violate due to the T1=2 containingrnfactor dominance

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