This article is a proposal for teaching the superconductivity for undergraduate students in sciences. Using the phenomenological formulation of Ginzburg-Landau, we intend to contribute to the learning of this important topic in contemporary physics which is rarely treated in the most theoretical physics books usually adopted in engineering courses, physics and chemistry. The Ginzburg-Landau theory is presented here in a didactic manner and with a greatly reduced level of complexity, so that the complicated concepts of quantum physics and advanced mathematics required for the complete study of the phenomenon are left aside, but without losing its importance. Three of the main features of superconducting materials are obtained in a relatively simple way, namely: 1 - The Meissner-Ochsenfeld effect, which is associated with the length of penetration 2 - The density of superconducting electrons within the material and the concept of coherence length and 3 - The existence of a critical magnetic field suficient to destroy the superconductivity effect. This text is an alternative to teaching superconductivity with some mathematical rigour but easily understandable to students of the first years of the undergraduate course.
superconductivity; Ginzburg-Landau theory.
