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Raman spectroscopy is a very powerful probe to study the nature ofquasi-particle excitations in condensed matter physics. The work presented inthis thesis is focused on two different families of novel materials, namely theiron-based superconductors (FeBS), multiferroic oxides and double perovskite.Although the properties of these two systems are quite different, somecomparison can still be drawn between them. For instance, in both of thesesystems magnetism plays a crucial role and intricate coupling between phononic,magnetic and orbital degrees of freedom is crucial to understand theirunderlying physics responsible for their various exotic physical properties.Understanding the microscopic origin of quasi-particle excitations, such asphonons, magnons, orbitons, plasmons etc., and coupling between them in thesecomplex materials, has been an intense field of research because it is believedthat these excitations hold the key for explaining their rich physics. Thesystems studied in the thesis include (A) FeBS - (i) FeSe0.82 (ii)Ce1-zYzFeAsO1-xFx (z = 0, 0.4; x = 0.1, 0.2) (iii) Ca4Al2O5.7Fe2As2 (iv)Ca(Fe1-xCox)2As2 (x = 0.03, 0.05). (B) Multiferroic oxides - (i) AlFeO3 (ii)TbMnO3 and double perovskite (iii) La2NiMnO6.

Spectroscopic Studies of Iron-based Superconductors, Multi-ferroic Oxides and Double-perovskite: Phonons, Electronic and Spin Excitations