Duarte E C S, Sardella E, Ortiz W A, Zadorosny R
Departamento de Física e Química, Universidade Estadual Paulista (UNESP), Faculdade de Engenharia de Ilha Solteira, Caixa Postal 31, 15385-000 Ilha Solteira-SP, Brazil.
J Phys Condens Matter. 2017 Oct 11;29(40):405605. doi: 10.1088/1361-648X/aa81e6. Epub 2017 Jul 25.
The manipulation and control of vortex states in superconducting systems are of great interest in view of possible applications, for which mesoscopic materials are good candidates. In this work, we studied the annihilation dynamics and the dissipative aspects of an Abrikosov's vortex-antivortex pair in a mesoscopic superconducting system with a concentric hole. The generalized time-dependent Ginzburg-Landau equations were numerically solved. The main result is the appearance of a phase slip-like line due to the elongation of the vortex and antivortex cores. Under specific circumstances, thermal dissipation might be associated with a sizeable relaxation of the order parameter, so that the energy released in the annihilation of a vortex-antivortex pair might become detectable in measurements of the magnetization as a function of time.
鉴于超导系统中涡旋态的操纵和控制在可能的应用方面具有很大意义，介观材料是很好的候选对象。在这项工作中，我们研究了具有同心孔的介观超导系统中阿布里科索夫涡旋 - 反涡旋对的湮灭动力学和耗散方面。对广义含时金兹堡 - 朗道方程进行了数值求解。主要结果是由于涡旋和反涡旋核的伸长出现了类似相位滑移的线。在特定情况下，热耗散可能与序参量的显著弛豫相关，从而在作为时间函数的磁化强度测量中，涡旋 - 反涡旋对湮灭时释放的能量可能变得可检测。
