Charge dynamics in 122 iron-based superconductors Aliaksei Charnukha

Format:

Book

Thesis/Dissertation

Author/Creator:

Charnukha, Aliaksei, author.

Series:

Springer theses 2190-5053

Language:

English

Subjects (All):

Iron-based superconductors--Optical properties.

Iron-based superconductors.

Nanotechnology.

Optical materials.

Physics.

Genre:

theses

dissertations

Academic theses

Physical Description:

1 online resource

Place of Publication:

Cham Springer [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

Contents:

Introduction

Iron-based superconductors

Experimental and theoretical methods

Results and discussion

Summary

Notes:

Ph. D. University of Stuttgart (2013?)

Includes bibliographical references

Online resource; title from PDF title page (SpringerLink, viewed September 16, 2013)

Other Format:

Printed edition:

ISBN:

9783319011929

3319011928

OCLC:

859316634

Access Restriction:

Restricted for use by site license