Abstract
This Chapter gives a short overview of the recently discovered family of iron-based superconductors and a comparison to the cuprates, the first and most profoundly studied family of high-temperature superconductors. Additionally, a short overview of theoretical calculations of the electronic band structure, expected magnetic instabilities and the Fermi surface topology will be given. A knowledge of the latter is necessary for the understanding of possible gap symmetries and the impact of intraband and interband impurity scattering processes, mainly when discussing the temperature dependence of the spin-lattice relaxation rate in the superconducting state of LaO0.9F0.1FeAs1-δ in Section 7.2.
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Notes
- 1.
The folded Brillouin zone corresponds to the crystallographic unit cell containing two Fe ions (and two As ions), to account for the fact that As ions are located above and below the FeAs-plane (see Fig. 4.1). The wave vector (π, π) in the folded Brillouin zone corresponds to (π,0) in the unfolded Brillouin zone with one Fe atom per unit cell [113].
- 2.
As discussed in Section 3.2.4 a sharp resonance peak is a result of different signs of the superconducting gap for \( {\vec k} \) and \( \vec k + \vec Q \) points generic for the s±-wave symmetry.
- 3.
The Fe excess might also play a role. Note however the high Curie temperature of single crystalline Fe: \( {T_c} = 1043{\rm{K}} \) [215].
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© 2012 Vieweg+Teubner Verlag | Springer Fachmedien Wiesbaden
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Hammerath, F. (2012). Iron-based Superconductors. In: Magnetism and Superconductivity in Iron-based Superconductors as Probed by Nuclear Magnetic Resonance. Vieweg+Teubner Verlag, Wiesbaden. https://doi.org/10.1007/978-3-8348-2423-3_4
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DOI: https://doi.org/10.1007/978-3-8348-2423-3_4
Publisher Name: Vieweg+Teubner Verlag, Wiesbaden
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Online ISBN: 978-3-8348-2423-3
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