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Charge Dynamics in 122 Iron-Based Superconductors (Paperback, Softcover reprint of the original 1st ed. 2014)
Loot Price: R3,298
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Charge Dynamics in 122 Iron-Based Superconductors (Paperback, Softcover reprint of the original 1st ed. 2014)
Series: Springer Theses
Expected to ship within 10 - 15 working days
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This thesis combines highly accurate optical spectroscopy data on
the recently discovered iron-based high-temperature superconductors
with an incisive theoretical analysis. Three outstanding results
are reported: (1) The superconductivity-induced modification of the
far-infrared conductivity of an iron arsenide with minimal chemical
disorder is quantitatively described by means of a strong-coupling
theory for spin fluctuation mediated Cooper pairing. The formalism
developed in this thesis also describes prior spectroscopic data on
more disordered compounds. (2) The same materials exhibit a sharp
superconductivity-induced anomaly for photon energies around 2.5
eV, two orders of magnitude larger than the superconducting energy
gap. The author provides a qualitative interpretation of this
unprecedented observation, which is based on the multiband nature
of the superconducting state. (3) The thesis also develops a
comprehensive description of a superconducting, yet optically
transparent iron chalcogenide compound. The author shows that this
highly unusual behavior can be explained as a result of the
nanoscopic coexistence of insulating and superconducting phases,
and he uses a combination of two complementary experimental methods
- scanning near-field optical microscopy and low-energy muon spin
rotation - to directly image the phase coexistence and
quantitatively determine the phase composition. These data have
important implications for the interpretation of data from other
experimental probes.
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