Field-induced reentrant superconductivity in thin films of nodal superconductors
Field-induced reentrant superconductivity in thin films of nodal superconductors
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DOI：
10.1103/physrevb.88.064519
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发表时间：
2013-08-30
影响因子：
3.7
通讯作者：
Ikeda, R.
中科院分区：
文献类型：
--
作者：
Hachiya, M.;Aoyama, K.;Ikeda, R.
先前关于节d波超导体的研究表明，当准粒子在其色散中获得波矢量中的额外线性项时，可以在没有磁场的情况下实现沿薄膜平面调制的富尔德-费雷尔-拉金-奥夫奇尼科夫-(FFLO-)类超导（SC）状态。在本工作中，研究了这种调制SC态在人工薄膜中对外加磁场的稳定性。作为薄膜单场-温度相图中两个不同起源的类fflo态（一个接近零场，另一个在高场端）存在的反映，常规SC态沿膜面均匀，在低场中通常倾向于以有序相为界的可重入相出现。
Previous work on nodal d-wave superconductors has shown that a Fulde-Ferrell-Larkin-Ovchinnikov-(FFLO-) like superconducting (SC) state, which is modulated along the film plane, can be realized with no magnetic field when quasiparticles acquire an additional linear term in the wave vector in their dispersion. In the present work, the stability of such a modulated SC state in an artificial film against an applied magnetic field is studied. As a reflection of the presence of two FFLO-like states of different origins, one close to zero field and the other at the high-field end, in a single field vs temperature phase diagram of thin films, the conventional SC state, which is uniform along the film plane, generally tends to appear as a reentrant ordered phase bounded by the normal phase in lower fields.