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 CaKFe
4As
4 and critical fluctuations in Ba(Fe
1-xCo
x)
2As
2. The fluctuations are analysed using a novel method tailored for the low energy Raman response.
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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 CaKFe
4As
4 and critical fluctuations in Ba(Fe
1-xCo
x)
2As
2. The fluctuations are anal...
»