Domain Meissner state and spontaneous vortex-antivortex generation in the ferromagnetic superconductor EuFe2(As0.79P0.21)2

Vasily S. Stolyarov* (Corresponding Author), Ivan S. Veshchunov, Sergey Yu. Grebenchuk, Denis S. Baranov, Igor A. Golovchanskiy, Andrey G. Shishkin, Nan Zhou, Zhixiang Shi, Xiaofeng Xu, Sunseng Pyon, Yue Sun, Wenhe Jiao, Guang-Han Cao, Lev Ya. Vinnikov, Alexander A. Golubov, Tsuyoshi Tamegai, Alexander I. Buzdin, Dimitri Roditchev

*Corresponding author for this work

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Abstract

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 EuFe2(As0.79P0.21)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 superconducting superlattices and control the vortex motion in ferromagnetic superconductors by tuning magnetic domains—unprecedented opportunity to consider for advanced superconducting hybrids.

Original languageEnglish
Article numbereaat1061
Number of pages8
JournalScience advances
Volume4
Issue number7
DOIs
Publication statusPublished - 13 Jul 2018

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vortex generators
superconductivity
vortices
ferromagnetism
superlattices
tuning
physics
magnetic fields

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Stolyarov, V. S., Veshchunov, I. S., Grebenchuk, S. Y., Baranov, D. S., Golovchanskiy, I. A., Shishkin, A. G., ... Roditchev, D. (2018). Domain Meissner state and spontaneous vortex-antivortex generation in the ferromagnetic superconductor EuFe2(As0.79P0.21)2. Science advances, 4(7), [eaat1061]. https://doi.org/10.1126/sciadv.aat1061
Stolyarov, Vasily S. ; Veshchunov, Ivan S. ; Grebenchuk, Sergey Yu. ; Baranov, Denis S. ; Golovchanskiy, Igor A. ; Shishkin, Andrey G. ; Zhou, Nan ; Shi, Zhixiang ; Xu, Xiaofeng ; Pyon, Sunseng ; Sun, Yue ; Jiao, Wenhe ; Cao, Guang-Han ; Vinnikov, Lev Ya. ; Golubov, Alexander A. ; Tamegai, Tsuyoshi ; Buzdin, Alexander I. ; Roditchev, Dimitri. / Domain Meissner state and spontaneous vortex-antivortex generation in the ferromagnetic superconductor EuFe2(As0.79P0.21)2. In: Science advances. 2018 ; Vol. 4, No. 7.
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title = "Domain Meissner state and spontaneous vortex-antivortex generation in the ferromagnetic superconductor EuFe2(As0.79P0.21)2",
abstract = "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 EuFe2(As0.79P0.21)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 superconducting superlattices and control the vortex motion in ferromagnetic superconductors by tuning magnetic domains—unprecedented opportunity to consider for advanced superconducting hybrids.",
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Stolyarov, VS, Veshchunov, IS, Grebenchuk, SY, Baranov, DS, Golovchanskiy, IA, Shishkin, AG, Zhou, N, Shi, Z, Xu, X, Pyon, S, Sun, Y, Jiao, W, Cao, G-H, Vinnikov, LY, Golubov, AA, Tamegai, T, Buzdin, AI & Roditchev, D 2018, 'Domain Meissner state and spontaneous vortex-antivortex generation in the ferromagnetic superconductor EuFe2(As0.79P0.21)2', Science advances, vol. 4, no. 7, eaat1061. https://doi.org/10.1126/sciadv.aat1061

Domain Meissner state and spontaneous vortex-antivortex generation in the ferromagnetic superconductor EuFe2(As0.79P0.21)2. / Stolyarov, Vasily S. (Corresponding Author); Veshchunov, Ivan S.; Grebenchuk, Sergey Yu.; Baranov, Denis S.; Golovchanskiy, Igor A.; Shishkin, Andrey G.; Zhou, Nan; Shi, Zhixiang; Xu, Xiaofeng; Pyon, Sunseng; Sun, Yue; Jiao, Wenhe; Cao, Guang-Han; Vinnikov, Lev Ya.; Golubov, Alexander A.; Tamegai, Tsuyoshi; Buzdin, Alexander I.; Roditchev, Dimitri.

In: Science advances, Vol. 4, No. 7, eaat1061, 13.07.2018.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Domain Meissner state and spontaneous vortex-antivortex generation in the ferromagnetic superconductor EuFe2(As0.79P0.21)2

AU - Stolyarov, Vasily S.

AU - Veshchunov, Ivan S.

AU - Grebenchuk, Sergey Yu.

AU - Baranov, Denis S.

AU - Golovchanskiy, Igor A.

AU - Shishkin, Andrey G.

AU - Zhou, Nan

AU - Shi, Zhixiang

AU - Xu, Xiaofeng

AU - Pyon, Sunseng

AU - Sun, Yue

AU - Jiao, Wenhe

AU - Cao, Guang-Han

AU - Vinnikov, Lev Ya.

AU - Golubov, Alexander A.

AU - Tamegai, Tsuyoshi

AU - Buzdin, Alexander I.

AU - Roditchev, Dimitri

PY - 2018/7/13

Y1 - 2018/7/13

N2 - 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 EuFe2(As0.79P0.21)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 superconducting superlattices and control the vortex motion in ferromagnetic superconductors by tuning magnetic domains—unprecedented opportunity to consider for advanced superconducting hybrids.

AB - 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 EuFe2(As0.79P0.21)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 superconducting superlattices and control the vortex motion in ferromagnetic superconductors by tuning magnetic domains—unprecedented opportunity to consider for advanced superconducting hybrids.

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Stolyarov VS, Veshchunov IS, Grebenchuk SY, Baranov DS, Golovchanskiy IA, Shishkin AG et al. Domain Meissner state and spontaneous vortex-antivortex generation in the ferromagnetic superconductor EuFe2(As0.79P0.21)2. Science advances. 2018 Jul 13;4(7). eaat1061. https://doi.org/10.1126/sciadv.aat1061