"Version: 20210201"--Title page verso.Includes bibliographical references.1. Introduction to superconductivity, superconducting materials and their usefulness -- 1.1. Brief introduction to the phenomenon of superconductivity -- 1.2. Does the resistance in the superconducting state really become zero? -- 1.3. Flow of charge carriers in a metal, an insulator and a superconductor -- 1.4. Meissner …