Authors: Ruiqi Huang Weilong She
Publish Date: 2016/07/12
Volume: 184, Issue: 5-6, Pages: 1030-1041
Abstract
The upper critical field and its anisotropy are the easiest properties to examine in the research of ironbased superconductors Based on warped cylindrical Fermi surface models we investigate the temperature and angle dependence of the upper critical field in detail by employing the quasiclassical formalism of the Werthamer–Helfand–Hohenberg WHH theory Our numerical results reveal the anisotropy of the upper critical field which may be caused by an anisotropic gap function eg dwave pairing or an anisotropic Fermi surface respectively Further according to our analysis this anisotropy can be modulated by the deformation of the Fermi surface and will be strongly suppressed by the Pauli paramagnetic effect
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