| Summary: | 碩士 === 國立中央大學 === 物理學系 === 101 === In nanoparticles are fabricated by employing thermal evaporation method and subsequently oxidized in air at a temperature under various oxidation times. XRD is utilized to determine the mean particle diameter (12.5 nm) of the In nanoparticles as grown. The composition of In/In2O3 is analyzed by refining the X-ray diffraction pattern using General Structural Analysis System (GSAS) program. In our study,the superconducting diamagnetic screening effect was measured through AC magnetic susceptibility (〖 χ〗^'=χ^'+iχ^'').The temperature dependence of in-phase component χ^' (T) can be described by the Scalapino’s expression,which allows extracting the superconducting transition temperature.There is an unconventional enhancement of critical (Tc) in the sample after oxidation.
The spin polarization effects are seen in M(H) curve which can be described by Langevin function,after fitting,we can get magnetic moment and saturated magnetization.The magnetic moment can be explained by thermal-induced effect.The saturated magnetization can be described by spin-wave excitation model.
After that,using GSAS to obtain In and In2O3 mass ratio,and saturated magnetization from Langevin function,we can figure out In and In2O3 magnetization.We found that the thermal-induced effect of In2O3 is more remarkable than In.
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