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The temperature dependence of upper critical field  μ   0   H  c2  of Ca 0.83 La 0.17 FeAs 2  and Ca 0.8 La 0.2 Fe 0.98 Co 0.02 As 2  single crystals are investigated by measuring the resistivity for the inter-plane ( H // c ) and in-plane ( H // ab ) directions in magnetic fields up to 60 T. It is found that  μ   0   H  c2 ( T ) of both crystals for  H // c  presents a sublinear temperature dependence with decreasing temperature, whereas the curve of  μ   0   H  c2 ( T ) for  H // ab  has a convex curvature and gradually tends to saturate at low temperatures.  μ   0   H  c2 ( T ) in both crystals deviates from the conventional Werthamer-Helfand-Hohenberg (WHH) theoretical model without considering spin paramagnetic effect for  H // c  and  H // ab  directions. Detailed analyses show that the behavior of  μ   0   H  c2 ( T ) in 112-type Iron-based superconductors (IBSs) is similar to that of most IBSs. Two-band model is required to fully reproduce the behavior of  μ   0   H  c2 ( T ) for  H // c , while the effect of spin paramagnetic effect is responsible for the behavior of  μ   0   H  c2 ( T ) for  H // ab .

Two-band and pauli-limiting effects on the upper critical field of 112-type iron pnictide superconductors