Nematic Order and Fluctuations in Iron-Based Superconductors

Una Karahasanovic, Rafael M. Fernandes, Joerg Schmalian

Research output: Chapter in Book/Report/Conference proceedingChapter


The goal of these lecture notes is to provide a semi-phenomenological explanation of the phase diagram of iron based superconductors, and to summarize theoretical predictions for the signatures of the nematic degrees of freedom in various experimentally measurable quantities. In most cases we will focus on the spin-driven nematic approach. We will use this approach to Construct a phase diagram for the iron-based superconductors;Develop a φ4 theory of the nematic phase and make the prediction about the nature of the nematic transition;Make predictions for the behaviour of the elastic modulus in the vicinity of a nematic/structural transition;Calculate the Raman response function, in the normal state and in the superconducting state;Calculate the resistivity anisotropy;Discuss the signatures of the Ising-nematic state in the magnetic spectrum. Finally, we will briefly address the impact of nematic fluctuations on superconductivity.

Original languageEnglish (US)
Title of host publicationSpringer Series in Solid-State Sciences
PublisherSpringer Science and Business Media Deutschland GmbH
Number of pages62
StatePublished - 2017

Publication series

NameSpringer Series in Solid-State Sciences
ISSN (Print)0171-1873
ISSN (Electronic)2197-4179

Bibliographical note

Funding Information:
Acknowledgements U.K. would like to thank the Helmholtz Association for support, through Helmholtz post-doctoral grant PD-075 “Unconventional order and superconductivity in pnic-tides”. J.S. acknowledges the support from Deutsche Forschungsgemeinschaft (DFG) through the Priority Program SPP 1458 “Hochtemperatur-Supraleitung in Eisenpniktiden” (project-no. SCHM 1031/5-1).

Publisher Copyright:
© 2017, Springer International Publishing AG.


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