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Non-Fermi-liquid (NFL) phenomena associated with correlation effects havebeen widely observed in the phase diagrams of unconventional superconductingfamilies. Exploration of the correlation between the normal state NFL,regardless of its microscopic origins, and the superconductivity has beenargued as a key to unveiling the mystery of the high-Tc pairing mechanism. Herewe systematically investigate the pressure-dependent in-plane resistivity andHall coefficient (RH ) of a high-quality 112-type Fe-based superconductorCa1-xLaxFe1-yCoyAs2 (x = 0.2,y = 0.02). With increasing pressure, thenormal-state resistivity of the studied sample exhibits a pronounced crossoverfrom non-Fermi-liquid to Fermi-liquid behaviors. Accompanied with thiscrossover, Tc is gradually suppressed. In parallel, the extremum in the Hallcoefficient RH (T ) curve, possibly due to anisotropic scattering induced byspin fluctuations, is also gradually suppressed. The symbiosis of NFL andsuperconductivity implies that these two phenomena are intimately related.Further study on the pressure-dependent upper critical field reveals that thetwo-band effects are also gradually weakened with increasing pressure andreduced to the one-band Werthamer-Helfand-Hohenberg limit in the low-Tc regime.Overall, our paper supports the picture that NFL, multigap, and extreme RH (T )are all of the same magnetic origin, i.e., the spin fluctuations in the 112iron arsenide superconductors.

Correlation between non-Fermi-liquid behavior and superconductivity in (Ca, La)(Fe,Co)As2 iron arsenides: A high-pressure study