By Aliaksei Charnukha

This thesis combines hugely actual optical spectroscopy facts at the lately came upon iron-based high-temperature superconductors with an incisive theoretical research. 3 impressive effects are stated: (1) The superconductivity-induced amendment of the far-infrared conductivity of an iron arsenide with minimum chemical affliction is quantitatively defined by way of a strong-coupling concept for spin
fluctuation mediated Cooper pairing. The formalism built during this thesis additionally describes previous spectroscopic facts on extra disordered compounds. (2) a similar fabrics express a pointy superconductivity-induced anomaly for photon energies round 2.5 eV, orders of importance better than the superconducting power hole. the writer presents a qualitative interpretation of this remarkable remark, that is according to the multiband nature of the superconducting nation. (3) The thesis additionally develops a accomplished description of a superconducting, but optically obvious iron chalcogenide compound. the writer indicates that this hugely strange habit should be defined a result of nanoscopic coexistence of insulating and superconducting stages, and he makes use of a mixture of 2 complementary experimental tools - scanning near-field optical microscopy and low-energy muon spin rotation - to at once picture the section coexistence and quantitatively ascertain the section composition. those information have vital implications for the translation of knowledge from different experimental probes.

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Charge Dynamics in 122 Iron-Based Superconductors (Springer Theses) by Aliaksei Charnukha

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