Domain Meissner state and spontaneous vortex-antivortex generation in the ferromagnetic superconductor EuFe 2 (As 0.79 P 0.21 ) 2
STOLYAROV, Vasily
Moscow Institute of Physics and Technology [Moscow] [MIPT]
Osipyan Institute of Solid State Physics [ISSP]
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Moscow Institute of Physics and Technology [Moscow] [MIPT]
Osipyan Institute of Solid State Physics [ISSP]
STOLYAROV, Vasily
Moscow Institute of Physics and Technology [Moscow] [MIPT]
Osipyan Institute of Solid State Physics [ISSP]
Moscow Institute of Physics and Technology [Moscow] [MIPT]
Osipyan Institute of Solid State Physics [ISSP]
BARANOV, Denis
Laboratoire de Physique et d'Etude des Matériaux (UMR 8213) [LPEM]
Moscow Institute of Physics and Technology [Moscow] [MIPT]
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Laboratoire de Physique et d'Etude des Matériaux (UMR 8213) [LPEM]
Moscow Institute of Physics and Technology [Moscow] [MIPT]
Langue
en
Article de revue
Ce document a été publié dans
Science Advances. 2018, vol. 4, n° 7, p. eaat1061
American Association for the Advancement of Science (AAAS)
Résumé en anglais
The interplay between superconductivity and magnetism is one of the oldest enigmas in physics. Usually, the strong exchange field of ferromagnet suppresses singlet superconductivity via the paramagnetic effect. In EuFe 2 ...Lire la suite >
The interplay between superconductivity and magnetism is one of the oldest enigmas in physics. Usually, the strong exchange field of ferromagnet suppresses singlet superconductivity via the paramagnetic effect. In EuFe 2 (As 0.79 P 0.21) 2 , a material that becomes not only superconducting at 24.2 K but also ferromagnetic below 19 K, the coexistence of the two antagonistic phenomena becomes possible because of the unusually weak exchange field produced by the Eu subsystem. We demonstrate experimentally and theoretically that when the ferromagnetism adds to superconductivity, the Meissner state becomes spontaneously inhomogeneous, characterized by a nanometer-scale striped domain structure. At yet lower temperature and without any externally applied magnetic field, the system locally generates quantum vortex-antivortex pairs and undergoes a phase transition into a domain vortex-antivortex state characterized by much larger domains and peculiar Turing-like patterns. We develop a quantitative theory of this phenomenon and put forth a new way to realize superconduct-ing superlattices and control the vortex motion in ferromagnetic superconductors by tuning magnetic domains— unprecedented opportunity to consider for advanced superconducting hybrids.< Réduire
Project ANR
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