Possible Distribution of Magnetic Vortices of Two-Band Mesoscopic Superconductors in Different Regions of Parameter Space

Qilin Songa, Dan Wanga, Wenjing Hua, Lin Penga, Yun Zhoub, Zhiyong Liuc, Jia Lina aDepartment of Physics, Shanghai University of Electric Power, Shanghai 201300, China bDepartment of Physics, China Jiliang University, Hangzhou 310018, China cShanghai Key Laboratory of High Temperature Superconductors, Physics Department, Shanghai University, 99 Shangda Road, Shanghai 200444, China

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Using a finite element method to the time-dependent two-band Ginzburg-Landau model we numerically explored the possible distribution of magnetic vortices of two-band mesoscopic superconductors in different regions of the parameters. The parameter space is defined by microscopic quantities such as partial density of states, the Fermi velocity ratio and elements of the coupling matrix. In particular, when the interband coupling and the Fermi velocity ratio are fixed, the critical temperatures of band activity (Tc1 and Tc2) are modulated by changing the partial densities of states, n1 and n2. Due to simulation results, we obtained possible distribution of magnetic vortices including fractional vortices and composite vortices.

DOI:10.12693/APhysPolA.139.673 topics: fractional vortices, composite vortices, mesoscopic superconductor