Comptes Rendus
no. 1-2
The phase diagrams of iron-based superconductors: Theory and experiments
[Les diagrammes de phases des supraconducteurs à base de fer : la théorie et les expériences]
Alberto Martinelli1  ; Fabio Bernardini2, 3 ; Sandro Massidda3
1 SPIN-CNR, C.so Perrone 24, 16152 Genova, Italy
2 Dipartimento di Fisica, Università di Cagliari, Cittadella Universitaria, 09042 Monserrato, Italy
3 IOM-CNR c/o Dipartimento di Fisica, Università di Cagliari, Cittadella Universitaria, 09042 Monserrato, Italy
Comptes Rendus. Physique, Volume 17 (2016) no. 1-2, pp. 5-35.

Les diagrammes de phase jouent un rôle de première importance dans la compréhension des propriétés des matériaux. En ce qui concerne les supraconducteurs à base de fer (Fe-SC), la définition correcte de leurs diagrammes de phase est cruciale à cause de l'intime interaction entre leurs propriétés cristallochimiques et magnétiques, d'une part, et la possible coexistence de magnétisme et de supraconductivité, d'autre part.

Les deux difficultés principales pour la compréhension des diagrammes de phase Fe-SC sont : 1) l'origine de la transformation structurelle ayant lieu pendant le refroidissement et sa relation avec le magnétisme ; 2) la description correcte de la région où survient un recouvrement entre les états fondamentaux électroniques, magnétiques et supraconducteur électronique survient. De ce fait, une définition appropriée et précise des frontières des phases structurelle, magnétique et électronique fournit un outil extrêmement puissant pour les scientifiques du domaine des matériaux.

Pour cette raison, une définition exacte des champs de phases thermodynamiques caractérisant les différentes propriétés structurelles et physiques impliquées est nécessaire, bien qu'elle ne soit pas aisée à obtenir dans de nombreux cas. De plus, les propriétés physiques peuvent souvent dépendre fortement de la survenue de caractéristiques micro-structurelles ou autres à l'échelle locale (micro-contraintes dans le réseau, fluctuations chimiques, parois de domaines, joints de grains, défauts), qui, d'ordinaire, ne sont pas décrites dans un diagramme de phases structurelles.

Dans cette revue, nous résumons de manière critique les résultats obtenus pour les systèmes composites le plus étudiés de types 11, 122 et 1111, qui établissent une corrélation entre les preuves expérimentales et la théorie.

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 crystallochemical 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.

Publié le :
DOI : 10.1016/j.crhy.2015.06.001
Keywords: Iron-based superconductors, Phase diagrams, Structural transformations, Superconductivity, Magnetism, Nematicity
Mot clés : Supraconducteurs à base de fer, Diagrammes de phase, Transformations structurels, Supraconductivité, Magnétisme, Phase nématique

Alberto Martinelli 1 ; Fabio Bernardini 2, 3 ; Sandro Massidda 3

1 SPIN-CNR, C.so Perrone 24, 16152 Genova, Italy
2 Dipartimento di Fisica, Università di Cagliari, Cittadella Universitaria, 09042 Monserrato, Italy
3 IOM-CNR c/o Dipartimento di Fisica, Università di Cagliari, Cittadella Universitaria, 09042 Monserrato, Italy 
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Alberto Martinelli; Fabio Bernardini; Sandro Massidda. The phase diagrams of iron-based superconductors: Theory and experiments. Comptes Rendus. Physique, Volume 17 (2016) no. 1-2, pp. 5-35. doi : 10.1016/j.crhy.2015.06.001. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2015.06.001/

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