[Supraconducteurs à base de fer en champ magnétique intense]
Nous passons en revue les mesures en fort champ magnétique des propriétés normales et supraconductrices des nouveaux composés supraconducteurs à base de fer. Nous rappelons les mécanismes qui limitent la supraconductivité à haut champ et discutons les informations sur la phase supraconductrice qui sont obtenues grâce à la mesure du champ critique supérieur, mais également les effets des fluctuations thermiques sur la détermination de celui-ci par des mesures de transport ou de chaleur spécifique. Nous discutons également la structure électronique de la phase normale, principalement par des mesures dʼoscillations quantiques comme lʼeffet de Haas–van Alphen. Ces résultats permettent de déterminer très précisément la topologie de la surface de Fermi et la masse des quasi-particules dans plusieurs supraconducteurs à base de fer des familles 1111, 122 et 111.
Here we review measurements of the normal and superconducting state properties of iron-based superconductors using high magnetic fields. We discuss the various physical mechanisms that limit superconductivity in high fields, and the information on the superconducting state that can be extracted from the upper critical field, but also how thermal fluctuations affect its determination by resistivity and specific heat measurements. We also discuss measurements of the normal state electronic structure focusing on measurement of quantum oscillations, particularly the de Haas–van Alphen effect. These results have determined very accurately, the topology of the Fermi surface and the quasi-particle masses in a number of different iron-based superconductors, from the 1111, 122 and 111 families.
Mots-clés : Supraconductivité, Fort champ magnétique, Supraconducteurs à base de fer, Champ critique supérieur, Oscillations quantiques
Amalia I. Coldea 1 ; Daniel Braithwaite 2 ; Antony Carrington 3
@article{CRPHYS_2013__14_1_94_0, author = {Amalia I. Coldea and Daniel Braithwaite and Antony Carrington}, title = {Iron-based superconductors in high magnetic fields}, journal = {Comptes Rendus. Physique}, pages = {94--105}, publisher = {Elsevier}, volume = {14}, number = {1}, year = {2013}, doi = {10.1016/j.crhy.2012.07.003}, language = {en}, }
Amalia I. Coldea; Daniel Braithwaite; Antony Carrington. Iron-based superconductors in high magnetic fields. Comptes Rendus. Physique, Physics in High Magnetic Fields / Physique en champ magnétique intense, Volume 14 (2013) no. 1, pp. 94-105. doi : 10.1016/j.crhy.2012.07.003. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2012.07.003/
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