By Aliaksei Charnukha
This thesis combines hugely exact optical spectroscopy info at the lately found iron-based high-temperature superconductors with an incisive theoretical research. 3 remarkable effects are stated: (1) The superconductivity-induced amendment of the far-infrared conductivity of an iron arsenide with minimum chemical illness is quantitatively defined by way of a strong-coupling idea for spin fluctuation mediated Cooper pairing. The formalism constructed during this thesis additionally describes past spectroscopic information on extra disordered compounds. (2) an identical fabrics convey a pointy superconductivity-induced anomaly for photon energies round 2.5 eV, orders of significance better than the superconducting strength hole. the writer offers a qualitative interpretation of this extraordinary remark, that's in line with the multiband nature of the superconducting kingdom. (3) The thesis additionally develops a complete description of a superconducting, but optically obvious iron chalcogenide compound. the writer exhibits that this hugely strange habit should be defined due to the nanoscopic coexistence of insulating and superconducting levels, and he makes use of a mixture of 2 complementary experimental equipment - scanning near-field optical microscopy and low-energy muon spin rotation - to at once photograph the part coexistence and quantitatively be certain the section composition. those facts have very important implications for the translation of knowledge from different experimental probes.
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Extra resources for Charge Dynamics in 122 Iron-Based Superconductors
The authors have shown that the symmetry and the in-plane anisotropy of these spin fluctuations are well captured by density-functional and itinerant-electron calculations in the random-phase approximation and can be traced back to the structural properties of the host compounds without invoking exotic nematic scenarios with a symmetry-broken electronic state. 5 Superconducting Properties While the mechanism of superconductivity in the iron-based superconductors is under debate, it has been shown theoretically that the electron–phonon coupling in these compounds is very weak and thus unable to account for the observed high superconducting transition temperatures  (for an overview of the superconducting gaps and transition temperatures of a large set of iron-based superconductors see Ref.
Crossover from weak to strong pairing in unconventional superconductors. Physical Review B, 83, 214520. 10.
Since the (±π, ±π ) nodal lines (dashed lines connecting the corners of the unfolded Brillouin zone) do not cross any of the Fermi surfaces, the superconducting gap exhibits no nodes. However, when the full body-centered tetragonal symmetry is taken into account, the hypothetical unfolded Brillouin zone is folded along the Q = (π, π, π ) vector, whose in-plane projection is shown here as a black dotted arrow. e. the gray shaded area is transferred by Q to become the portion of the folded Brillouin zone marked with thick dashed lines.
Charge Dynamics in 122 Iron-Based Superconductors by Aliaksei Charnukha