A theory of the upper critical field in antiferromagnetic superconductors
- Cite this article as:
- Mahanti, S.D., Sinha, K.P. & Atre, M.V. J Low Temp Phys (1981) 44: 1. doi:10.1007/BF00115071
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A generalized Ginzburg-Landau approach is used to study the nonmonotonic temperature dependence of the upper critical field Hc2(T) in antiferromagnetic superconductors RE(Mo)6S8; RE = Dy, Tb, Gd. It is found that electrodynamic effects incorporated through screening and indirect coupling between the staggered magnetization MQ(T) and superconducting order parameter ψ cannot explain the observed nonmonotonicity. This suggests that the direct coupling between the two order parameters should be considered to understand the experimental results, a finding which is consistent with recent microscopic calculations.