The phase diagrams of iron-based superconductors: theory and experiments

Abstract

Phase diagrams play a primary role in the understanding of materials properties. For iron-based superconductors (Fe-SC), the correct definition of their phase diagrams is crucial because of the close interplay between their crystallo-chemical and magnetic properties, on one side, and the possible coexistence of magnetism and superconductivity, on the other. The two most difficult issues for understanding the Fe-SC phase diagrams are: 1) the origin of the structural transformation taking place during cooling and its relationship with magnetism; 2) the correct description of the region where a crossover between the magnetic and superconducting electronic ground states takes place. Hence a proper and accurate definition of the structural, magnetic and electronic phase boundaries provides an extremely powerful tool for material scientists. For this reason, an exact definition of the thermodynamic phase fields characterizing the different structural and physical properties involved is needed, although it is not easy to obtain in many cases. Moreover, physical properties can often be strongly dependent on the occurrence of micro-structural and other local-scale features (lattice micro-strain, chemical fluctuations, domain walls, grain boundaries, defects), which, as a rule, are not described in a structural phase diagram. In this review, we critically summarize the results for the most studied 11-, 122- and 1111-type compound systems, providing a correlation between experimental evidence and theory.

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• Iron-based superconductivity extended to the novel silicide LaFeSiH
• Hund-enhanced electronic compressibility in FeSe and its correlation with T${}_c$
• Magnetism and superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Iron-based superconductors: tales from the nuclei
• Hund's metal crossover and superconductivity in the 111 family of iron-based superconductors
• Co-doping effects on magnetism and superconductivity in the 112-type EuFeAs2 system
• A unified phase diagram of F-doped LaFeAsO by means of NMR and NQR parameters
• Electronic Scattering Effects in Europium-Based Iron Pnictides
• Iron-based superconductors: Foreword
• Magnetic and superconducting phase diagram of Eu(Fe${}_{1-x}$Ni${}_x$)As${}_2$
• Structural investigation of the Sm(Fe1-xRux)As(O0.85F0.15) system: a synchrotron X-ray powder diffraction study
• Fast recovery of the pristine magnetic and structural phases in superconducting LaFeAsO${}_{0.89}$F${}_{0.11}$ by Mn/Fe substitution
• Magnetic and structural properties of the iron silicide superconductor LaFeSiH
• Rationalizing doping and electronic correlations in LaFe${}_2$As${}_2$
• Tuning the magnetocrystalline anisotropy in $R$CoPO by means of $R$ substitution: a ferromagnetic resonance study
• PhD Thesis: Electronic correlations in multiorbital systems