Presentation Information
[PCP2-09]A Microscopic Simulation of Vortex Pinning in a Dirty Superconductor
*Masaru Kato1,2, Yoichi Higashi2 (1. Department of Physics and Electronics, Osaka Metropolitan University (Japan), 2. National Institute of Advanced Industrial Science and Technology (AIST) (Japan))
Keywords:
Vortex,Eilenberger Equation,Vortex Pinning,Finite Element Method
[Purpose] Vortex pinning in a superconductor is important for application of superconductor. A vortex have a normal core where quasi-particles exist. Therefore we investigate microscopic origin of vortex pinning state. Previously we obtained the critical temperature enhancement [1-5] in nano-sized dirty superconductors. We extendsimilar method for vortex structures in dirty superconductors.
[Method] We use the Eilenberger equation, which is a quasi-classical equation for electrons in a superconductor. We include the impurity potential into the Eilenberger equation. And we solve it using the finite element method.
[Results] We find the vortex structure and also bound quasi-particle states are deformed according to the local structure of impurity potential.
[Consideration] Vortex structure is affected by the core quasiparticle structure.
[Conclusion] Microscopic simulation is effective for vortex pinning because quasi-particle structure can affect the vortex structure and pinning force.
[1] M. Umeda and M. Kato, IEEE Trans. Appl. Supercond. 26 (2016) 8600104 (1-4).
[2] M. Umeda and M. Kato, J. Phys. Comm. 3, 105002 (1-7) (2019)
[3] M. Umeda and M. Kato, Physica C 560 (2019) 45-66
[4] M. Umeda and M. Kato, J. Appl. Phys. 126 143905 (1-7) (2019).
[5] T. Tamai, T. Nishizaki and M. Kato, IEEE TRANS. APPLI. SUPERCOND.,32 8000604 (2022)
[Method] We use the Eilenberger equation, which is a quasi-classical equation for electrons in a superconductor. We include the impurity potential into the Eilenberger equation. And we solve it using the finite element method.
[Results] We find the vortex structure and also bound quasi-particle states are deformed according to the local structure of impurity potential.
[Consideration] Vortex structure is affected by the core quasiparticle structure.
[Conclusion] Microscopic simulation is effective for vortex pinning because quasi-particle structure can affect the vortex structure and pinning force.
[1] M. Umeda and M. Kato, IEEE Trans. Appl. Supercond. 26 (2016) 8600104 (1-4).
[2] M. Umeda and M. Kato, J. Phys. Comm. 3, 105002 (1-7) (2019)
[3] M. Umeda and M. Kato, Physica C 560 (2019) 45-66
[4] M. Umeda and M. Kato, J. Appl. Phys. 126 143905 (1-7) (2019).
[5] T. Tamai, T. Nishizaki and M. Kato, IEEE TRANS. APPLI. SUPERCOND.,32 8000604 (2022)