Unconventional superconductivity generally occurs in proximity to magnetic phases. Raman spectroscopy affords a window into most of the related excitations including pairing interactions. Thus, the superconducting ground state and putative sub-leading pairing tendencies can be probed along with magnetic excitations and fluctuations. In this thesis, Raman spectroscopy identifies the hierarchy of pairing channels in CaKFe₄As₄ and critical fluctuations in Ba(Fe_1-xCo_x)₂As₂. The fluctuations are analysed using a novel method tailored for the low energy Raman response.      «

Unconventional superconductivity generally occurs in proximity to magnetic phases. Raman spectroscopy affords a window into most of the related excitations including pairing interactions. Thus, the superconducting ground state and putative sub-leading pairing tendencies can be probed along with magnetic excitations and fluctuations. In this thesis, Raman spectroscopy identifies the hierarchy of pairing channels in CaKFe₄As₄ and critical fluctuations in Ba(Fe_1-xCo_x)₂As₂. The fluctuations are anal...     »