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We revisit the Aslamazov-Larkin theory of paraconductivity in two dimensions,to distinguish its universal features from the specific features of nearly-freepaired fermions. We show that both the numerical prefactor and the temperaturedependence of the experimental paraconductivity in underdoped La_{2-x}Sr_xCuO_4are only compatible with pairing of nearly-free fermionic quasiparticles. Thisconclusion is strengthened by the analysis of paraconductivity data in thepresence of a finite magnetic field, from which we extract a rather low valueof the critical field H_{c2}(T=0).

Evidences for pairing of nearly-free quasiparticles from paraconductivity in layered superconducting cuprates