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Materials | Charge Dynamics in 122 Iron-Based Superconductors

Charge Dynamics in 122 Iron-Based Superconductors

Series: Springer Theses

Charnukha, Aliaksei

2014, XI, 130 p. 43 illus., 24 illus. in color.

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  • Nominated as an outstanding Ph.D. thesis by the Max Planck Institute for Solid State Research, Germany
  • Applies multiple independent experimental probes to reveal several common trends in the charge dynamics of 122 iron-based superconductors
  • Provides a universal description of the optical conductivity of 122 iron pnictides in the framework of the Eliashberg theory of superconductivity
  • Presents the discovery of the nanoscale layering of superconducting and antiferromagnetic phases in 245 iron selenides
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.

Content Level » Research

Keywords » Arsenides - Broadband Spectroscopic Ellipsometry - Chalcogenides - Correlated Electron Systems - Eliashberg Theory - Selenides - Solid-State Spectroscopy - Superconductivity in Iron Pnictides

Related subjects » Condensed Matter Physics - Materials - Nanotechnology - Optical & Electronic Materials - Optics & Lasers

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