Low temperature physics has around 50 year’s old history in Bulgaria. The contribution of S. Ivanov and E. Leyarovski is leading in this area. Self made low temperature apparatuses, new methods, high-temperature superconducting materials and theoretical models are objects of this study. We examine highly effective method for separation of noble gases by the air, technologies for production and conservation of inert gases, high-temperature superconductor with zero resistance at 86.5 K and vibronic model of high-temperature superconductivity created in Bulgarian Academy of Sciences.

Keywords: history, physics, Bulgaria, low temperatures, superconductivity