[Supraconducteurs magnétiques conventionnels : coexistence de la superconductivité singulet et de l'ordre magnétique]
Nous passons en revue la physique de base des supraconducteurs magnétiques massifs appliquée au problème de la coexistence de la supraconductivité singulet (SC) et de l'ordre magnétique. L'interelation entre l'interaction d'échange (EX) et l'interaction électromagnétique (EM) est discutée. Nous argumentons sur le fait que la SC singulet et l'ordre ferromagnétique (F) uniforme ne coexistent pratiquement jamais. En cas de coexistence mutuelle, l'ordre F est modifié en une structure spiralée dépendant de l'anistropie magnétique. Il s'avère que cette situation est réalisée dans plusieurs supraconducteurs, notamment dans ErRh4B4, HoMo6S8, HoMo6Se8 avec un ordre électronique et dans AuIn2 avec un ordre magnétique nucléaire. Ce dernier problème est brièvement discuté.
La coexistence de la SC avec l'antiferromagnétisme (AF) est plus favorable qu'avec l'ordre F modifié. La physique des systémes AF avec SC et ferromagnétisme faible est très intéressante et produit un diagramme de phases très riche.
Les supraconducteurs magnétiques sous champ magnétique présentent certaines propriétés très particulières, notamment au voisinage de la température de transition (ferro)magnétique, température à laquelle le champ critique supérieur devient plus faible que le champ critique thermodynamique.
Nous discutons aussi l'intéressante physique des jonctions Josephson à base de MS avec ordre magnétique spiral. L'existence d'une amplitude d'appariement triplet
The basic physics of bulk magnetic superconductors (MS), related to the problem of the coexistence of singlet superconductivity (SC) and magnetic order, is reviewed. The interplay between the exchange (EX) and electromagnetic (EM) interaction is discussed. It is argued that the singlet SC and uniform ferromagnetic (F) order practically never coexist. In the case of their mutual coexistence the F order is modified into a domain-like or spiral structure depending on magnetic anisotropy. It turns out that this situation occurs in several superconductors such as ErRh4B4, HoMo6S8, HoMo6Se8 with electronic and in AuIn2 with nuclear magnetic order. The latter problem is briefly discussed.
The coexistence of SC with antiferromagnetism (AF) is more favorable than with the modified F order. Very interesting physics is realized in AF systems with SC and weak-ferromagnetism which results in an very rich phase diagram.
A number of properties of magnetic superconductors in magnetic field are very peculiar, especially near the (ferro)magnetic transition temperature, where the upper critical field becomes smaller than the thermodynamical critical field.
The interesting physics of Josephson junctions based on MS with spiral magnetic order is also discussed. The existence of the triplet pairing amplitude
Mots-clés : Superconductivité, Coexistence, Ordre magnétique, Amplitude d'appariement triplet, Contact Josephson π, Qubits
Miodrag L. Kulić 1, 2
@article{CRPHYS_2006__7_1_4_0, author = {Miodrag L. Kuli\'c}, title = {Conventional magnetic superconductors: coexistence of singlet superconductivity and magnetic order}, journal = {Comptes Rendus. Physique}, pages = {4--21}, publisher = {Elsevier}, volume = {7}, number = {1}, year = {2006}, doi = {10.1016/j.crhy.2005.11.012}, language = {en}, }
Miodrag L. Kulić. Conventional magnetic superconductors: coexistence of singlet superconductivity and magnetic order. Comptes Rendus. Physique, Superconductivity and magnetism, Volume 7 (2006) no. 1, pp. 4-21. doi : 10.1016/j.crhy.2005.11.012. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2005.11.012/
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