Ginzburg-Landau Theory for Magneto-Elastic Interaction and Magnetization in Type-II Superconductors
Ginzburg-Landau Theory for Magneto-Elastic Interaction and Magnetization in Type-II Superconductors
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II 型超导体磁弹性相互作用和磁化的金兹堡-朗道理论
DOI：
10.1002/andp.201800266
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发表时间：
2018
影响因子：
2.4
通讯作者：
Gao Yuanwen
中科院分区：
文献类型：
--
作者：
Li Yingxu;Kang Guozheng;Gao Yuanwen
第二类超导体中涡旋与晶格（通量量子和原子的周期性阵列）之间的相互作用通过金兹伯格-朗道理论进行评估。研究发现，在各向同性晶体中，磁弹性耦合能抵消了弹性驱动的涡间相互作用能。因此，弹性响应完全由单独的涡流引起。此外，涡格单元中的应变随与涡核的距离二次衰减，这允许在单元边界处截止。最后得出结论：如果弹性常数的跃变可比拟为1，则弹性能在涡旋晶格与晶体弹性之间的竞争中占主导地位。该效应可能导致可逆磁化中的第二磁化峰。
The interaction between vortex and crystal lattice (periodic arrays of flux quantum and atoms) in type‐II superconductors is evaluated through Ginzburg–Landau theory. It is found that, in an isotropic crystal, the magneto‐elastic coupling energy counteracts the elasticity‐driven intervortex interaction energy. Thus, the elastic response is induced entirely by individual vortices taken separately. Furthermore, the strain in a vortex‐lattice cell decays quadratically with the distance from the vortex core, which allows a cutoff at the cell boundary. Finally, it could be concluded that if the jump in the elastic constant atis comparable to unity, the elasticity energy dominates the competition between the vortex lattice and crystal elasticity. This effect likely results in the second magnetization peak in the reversible magnetization.