| Description |
The magnetism of single impurity atom in different hosts is a subject of interest from years. Microscopic studies using nuclear methods provide valuable information regarding solid state phenomenon at short length and time scales. I have used the time differential perturbed angular distribution technique to study: (i) local magnetic behavior of isolated Fe impurities in nanocrystalline Nb, (ii) Magnetic ordering phenomenon in CaFe2As2, (iii) defect induced magnetism in highly oriented pyrolytic graphite (HOPG). In this talk I will present the results obtained for single impurity magnetism of Fe in nanocrystalline Nb and the strongly correlated electron system CaFe2As2. In the first case, I will discuss the effects of crystal size on moment formation. In the second case, we have observed the existence of local moment on Fe in tetragonal phase of CaFe2As2 which was not seen from bulk studies.
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