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Charge Dynamics in 122 Iron-Based Superconductors pp 13–45Cite as

Iron-Based Superconductors

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Abstract

Two decades into the intensive study of the cuprate superconductors, the condensed-matter community got stirred up once again when another completely different family of superconductors was discovered by the group of Hideo Hosono in 2006 [1]

It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts

—Sherlock Holmes, A Scandal in Bohemia

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Notes

  1. 1.

    In this work we adopt the generalized definition of ‘high-temperature superconductors’ as materials with the superconducting transition temperature above 28 K (\(T_{\mathrm{{c}}}\) of most conventional superconductors falls below this value. A well-known exception is MgB\(_2\) with \(T_{\mathrm{{c}}}\) \(=39\,\mathrm K \) [3], which is a conventional, albeit a two-band superconductor). This definition differs from the historical, industrially important, notion of high-temperature superconductors as materials with \(T_{\mathrm{{c}}}\) above the boiling point of liquid nitrogen (77 K).

  2. 2.

    with the exception of the iron-selenide compounds with vacancy ordering, which are dominated by an antiferromagnetic semiconducting phase at room temperature. Their complete classification is complicated by the fact that no single-phase superconducting compounds have been synthesized up to date and even the identification of the parent compound of this class of materials appears problematic.

  3. 3.

    Although the superconducting gap does depend on the coupling strength, its dependence on other quantities complicates the extraction of the pairing strength alone [36].

  4. 4.

    The magnetic scattering function is connected to the differential neutron scattering cross-section (intensity) per atom via \(d^2\sigma /N d\Omega dE_{\mathrm{f }}=(k_{\mathrm{f }}/k_{\mathrm{i }})\left| b\right| ^2S(\mathbf{Q},\omega )\), where \(N\) is the total number of atoms, \(\Omega \) is the scattering solid angle, \(E_{\mathrm{f }}\) is the final energy, \(k_{\mathrm{f,i }}\) is the final (initial) wave vector of neutrons, and \(b\) is the scattering length.

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  1. Solid-State Spectroscopy, Max Planck Institute for Solid State Research, Heisenbergstr 1, 70569, Stuttgart, Germany

    Aliaksei Charnukha

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Charnukha, A. (2014). Iron-Based Superconductors. In: Charge Dynamics in 122 Iron-Based Superconductors. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-01192-9_2

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