04777nam 22008655 450 991030038190332120200630180518.03-319-01192-810.1007/978-3-319-01192-9(CKB)2670000000428545(EBL)1466759(SSID)ssj0001010774(PQKBManifestationID)11551946(PQKBTitleCode)TC0001010774(PQKBWorkID)11000943(PQKB)11309525(MiAaPQ)EBC1466759(DE-He213)978-3-319-01192-9(PPN)172423651(EXLCZ)99267000000042854520130912d2014 u| 0engur|n|---|||||txtccrCharge Dynamics in 122 Iron-Based Superconductors /by Aliaksei Charnukha1st ed. 2014.Cham :Springer International Publishing :Imprint: Springer,2014.1 online resource (139 p.)Springer Theses, Recognizing Outstanding Ph.D. Research,2190-5053Description based upon print version of record.3-319-01191-X Includes bibliographical references.Introduction -- Iron-based superconductors -- Experimental and theoretical methods -- Results and discussion -- Summary.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.Springer Theses, Recognizing Outstanding Ph.D. Research,2190-5053SuperconductivitySuperconductorsSpectroscopyMicroscopyOptical materialsElectronic materialsNanoscale scienceNanoscienceNanostructuresNanotechnologyStrongly Correlated Systems, Superconductivityhttps://scigraph.springernature.com/ontologies/product-market-codes/P25064Spectroscopy and Microscopyhttps://scigraph.springernature.com/ontologies/product-market-codes/P31090Optical and Electronic Materialshttps://scigraph.springernature.com/ontologies/product-market-codes/Z12000Nanoscale Science and Technologyhttps://scigraph.springernature.com/ontologies/product-market-codes/P25140Nanotechnologyhttps://scigraph.springernature.com/ontologies/product-market-codes/Z14000Superconductivity.Superconductors.Spectroscopy.Microscopy.Optical materials.Electronic materials.Nanoscale science.Nanoscience.Nanostructures.Nanotechnology.Strongly Correlated Systems, Superconductivity.Spectroscopy and Microscopy.Optical and Electronic Materials.Nanoscale Science and Technology.Nanotechnology.530.41537.6537.6233Charnukha Aliakseiauthttp://id.loc.gov/vocabulary/relators/aut791352BOOK9910300381903321Charge Dynamics in 122 Iron-Based Superconductors1768732UNINA