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Author Charnukha, Aliaksei,
Title Charge dynamics in 122 iron-based superconductors / Aliaksei Charnukha.
Imprint Cham : Springer, [2013?]

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Author Charnukha, Aliaksei,
Series Springer theses, 2190-5053
Springer theses. 2190-5053
Subject Iron-based superconductors -- Optical properties.
Description 1 online resource (xi, 130 pages) : illustrations (some color).
Thesis Ph. D. University of Stuttgart (2013?)
Contents Introduction -- Iron-based superconductors -- Experimental and theoretical methods -- Results and discussion -- Summary.
Bibliography Note Includes bibliographical references.
Note Online resource; title from PDF title page (SpringerLink, viewed September 16, 2013).
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.
ISBN 9783319011929 (electronic bk.)
3319011928 (electronic bk.)
ISBN/ISSN 10.1007/978-3-319-01192-9
OCLC # 859316634
Additional Format Printed edition: 9783319011912

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