| Charge Dynamics in 122 Iron-Based Superconductors Softcover Repri Edition Contributor(s): Charnukha, Aliaksei (Author) |
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ISBN: 3319377523 ISBN-13: 9783319377520 Publisher: Springer OUR PRICE: $104.49 Product Type: Paperback - Other Formats Published: August 2016 |
| Additional Information |
| BISAC Categories: - Technology & Engineering | Superconductors & Superconductivity - Science | Nanoscience - Science | Spectroscopy & Spectrum Analysis |
| Dewey: 530.41 |
| Series: Springer Theses |
| Physical Information: 0.31" H x 6.14" W x 9.21" (0.47 lbs) 130 pages |
| Descriptions, Reviews, Etc. |
| Publisher Description: 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. |