Magnetically-controlled Vortex Dynamics in a Ferromagnetic Superconductor
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arXiv
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2024
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| author | Wilcox, Joseph Alec Schneider, Lukas Marchiori, Estefani Plastovets, Vadim Buzdin, Alexandre Sahafi, Pardis Jordan, Andrew Budakian, Raffi Ren, Tong Veschunov, Ivan Tamegai, Tsuyoshi Friedemann, Sven Poggio, Martino Bending, Simon John |
| author_facet | Wilcox, Joseph Alec Schneider, Lukas Marchiori, Estefani Plastovets, Vadim Buzdin, Alexandre Sahafi, Pardis Jordan, Andrew Budakian, Raffi Ren, Tong Veschunov, Ivan Tamegai, Tsuyoshi Friedemann, Sven Poggio, Martino Bending, Simon John |
| contents | Ferromagnetic superconductors are exceptionally rare because the strong ferromagnetic exchange field usually destroys singlet superconductivity. EuFe$_2$(As$_{1-x}$P$_x$)$_2$, an iron-based superconductor with a maximum critical temperature of 25 K, uniquely exhibits full coexistence with ferromagnetic order below $T_\mathrm{FM}$ $\simeq$ $19$ K. The interplay leads to narrowing of ferromagnetic domains at higher temperatures and spontaneous nucleation of vortices/antivortices at lower temperatures. Here we demonstrate how the underlying magnetic structure controls the superconducting vortex dynamics in applied magnetic fields. Just below $T_\mathrm{FM}$ we observe a pronounced peak in the creep activation energy, and magnetic force microscopy measurements reveal the presence of very closely-spaced ($w\ll λ$) vortex clusters. We attribute these observations to the formation of vortex polarons for which we present a theoretical description. In contrast, we link strong magnetic irreversibility at low temperatures to a critical current governed by giant flux creep over an activation barrier for vortex-antivortex annihilation near domain walls. Our work suggests new routes for the magnetic enhancement of vortex pinning with important applications in high-current conductors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_04098 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Magnetically-controlled Vortex Dynamics in a Ferromagnetic Superconductor Wilcox, Joseph Alec Schneider, Lukas Marchiori, Estefani Plastovets, Vadim Buzdin, Alexandre Sahafi, Pardis Jordan, Andrew Budakian, Raffi Ren, Tong Veschunov, Ivan Tamegai, Tsuyoshi Friedemann, Sven Poggio, Martino Bending, Simon John Superconductivity Strongly Correlated Electrons Ferromagnetic superconductors are exceptionally rare because the strong ferromagnetic exchange field usually destroys singlet superconductivity. EuFe$_2$(As$_{1-x}$P$_x$)$_2$, an iron-based superconductor with a maximum critical temperature of 25 K, uniquely exhibits full coexistence with ferromagnetic order below $T_\mathrm{FM}$ $\simeq$ $19$ K. The interplay leads to narrowing of ferromagnetic domains at higher temperatures and spontaneous nucleation of vortices/antivortices at lower temperatures. Here we demonstrate how the underlying magnetic structure controls the superconducting vortex dynamics in applied magnetic fields. Just below $T_\mathrm{FM}$ we observe a pronounced peak in the creep activation energy, and magnetic force microscopy measurements reveal the presence of very closely-spaced ($w\ll λ$) vortex clusters. We attribute these observations to the formation of vortex polarons for which we present a theoretical description. In contrast, we link strong magnetic irreversibility at low temperatures to a critical current governed by giant flux creep over an activation barrier for vortex-antivortex annihilation near domain walls. Our work suggests new routes for the magnetic enhancement of vortex pinning with important applications in high-current conductors. |
| title | Magnetically-controlled Vortex Dynamics in a Ferromagnetic Superconductor |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2412.04098 |