The Iron Pnictide Superconductors

<p>1. "Fe based Superconductors: Materials, phase diagrams, and spectroscopy”</p> <p> (i) Overview on Materials and General Phase Diagrams of Fe based Superconductors<br/> (ii) Low energy probes of the physical properties of Fe based superconductors<br/> (iii) Electron spectroscopy on Fe based superconductors<br/> (iv) Aspects of STM on Fe based superconductors<br/> (v) Experimental Studies of Nematic Order in Fe based SC<br/>  </p> <p>written by Prof. Dr. Bernd Büchner <br/> Institute for Solid State Research<br/> Helmholtzstraße 20<br/> 01171 Dresden, Germany</p> <p> </p> 2. "Modeling many-body physics in Fe-superconductors and other multi-orbital materials with the Slave-Spin mean-field: Mott and Hund's physics"<br/> (i) Interactions and correlations. Single-particle vs many-body physics. Chemistry of correlated materials. <br/> (ii) Introduction to the Slave-spin method. Auxiliary variables. Mean-field decoupling&lt; (iii) The Mott-Hubbard transition. Strongly Correlated Fermi-liquids<br/> (iv) Multi-orbital Hubbard models. Hund’s coupling. Mott transition in a multi-orbital context.<br/> (v) Slave-spin mean-field for realistic correlated band structures. Mott and Hund’s physics in Fe-based pnictides. Comparison with experiments.<p></p> <p> </p> <p>written by</p> <p>Prof. Massimo Capone<br/> Scuola Internazionale Superiore di Studi Avanzati <br/> via Bonomea, 265 Trieste ITALY<br/> Dr. Luca de' Medici<br/> European Synchrotron Radiation Facility (ESRF) <br/> Grenoble, France<br/> <br/> </p> <p>3. "Cooper-pairing, magnetic frustration, and spin fluctuations in iron-based superconductors"<br/> (i) Leading instabilities in ferropnictides: weak-coupling analysis, RPA and renormalization group study, comparison to cuprates.<br/> (ii) Magnetic order: manifold of the ground states, C2 and C4 phases, selection of the magnetic states, role of spin orbit coupling.<br/> (ii</p>i) Spin excitations in the magnetic state within itinerant description: magnetic anisotropy of the excitations, coexistence with the superconducting state.<br/> (iv) SC state: multiband effects beyond simple s+- (nodal structure, role of additional hole pockets with difference orbital structure), role of 'simple' disorder on Tc, quasiparticle interference.<p></p> <p><strong>written by Prof. Dr. Ilya Eremin </strong><br/> Ruhr-Universität Bochum <br/> Universitätstraße 150 <br/> 44801 Bochum, Germany<br/> <br/> <strong></strong></p> <p><strong>4. "</strong>Nematic order and fluctuations in iron based superconductors"<br/> (i) Summary of collective field theories of magnetism<br/> a) Order-parameter field theory from a microscopic Hamiltonian<br/> b) Solution of the field theory (introduction to the large-N approach)<br/> (ii) Emergent nematic order in iron based systems<br/> a) Order-parameter theory of stripe magnetic order<br/> b) Analysis of the large-N limit and Isin</p>g-nematicity<br/> (iii) Phase diagram and observables I<br/> a) Analysis of the phase diagram<br/> b) Nematic susceptibility and elastic properties<br/> (iv) Phase diagram and observables II<br/> a) Anisotropy of the resistivity<br/> b) Raman scattering  and nematic susceptibility<br/> (v) Impact on superconductivity <br/> a) Raman resonance mode in the superconducting state<br/> b) Nematic fluctuations and pairing.<strong> </strong><p></p> written by <strong>Prof. Dr. Jörg Schmalian</strong><br/> Karlsruhe Institut für Technologie<br/> Wolfgang-Gaede-Str. 1<br/> D-76131 Karlsruhe, Germany <br/> <br/>