Superconductivity pdf notes

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The superconductor is provided in two geometres. First, a smal dìslCwiTh a smal hole drlled into its center) can be used to study the Meissner effect. We have provided permanent magnetics which can be levitated and an inductor which can be used to measure changes in the permeabilty of the superconductor. The second Добро пожаловать на сайт ИФТТ РАН! Superconductivity: Basics and Formulation 1.1 Introduction The Bardeen-Cooper-Schrieffer (BCS) theory captures the essential physics that gives rise to the condensation of the Cooper pairs into a coherent superconduct-ing state. It specifically deals with a homogeneous and clean system in three di- Physics 460 F 2000 Lect 23 2 Outline • Superconductivity - Concepts and Theory • Key points Exclusion of magnetic fields can be used to derive energy of the superconducting state Heat Capacity shows there is a gap J. R. Waldram, Superconductivity of Metals and Cuprates (1996) D.R. Tilley and J. Tilley, Superfluidity and Superconductivity P. Komarek, Hochstromanwendungen der Supraleitung (1995) T. P. Sheathen, Introduction to High T c Superconductivity (1994) M. Acquarone, High Temperature Superconductivity (1996) WMI Lecture Notes Superconductivity Lecture Notes The course note begins with a description of the changes in the properties of metals on becoming superconducting. The thermodynamics of the associated phase transition is then elucidated. Author (s): Prof Prabhakar P. Singh and Prof. Avinash V. Mahajan NA Pages Superconductivity in Metals and Alloys In the lecture notes, we will discuss the exotic behavior of superconductor and the remarkable theories for deep understanding. The existence of these universal physical properties implies superconductivity is a thermodynamic phase of matter. Thus, the description of those properties does not need microscopic detail of the material. 2.1 Superconductivity simply states that there is no resistance or almost zero resistance in the material or any object. A material or an object that shows such properties is known as a superconductor. The conductivity referred to here is the electrical conductivity of a material. When the electrical conductivity is to the full potential facing Superconductivity observation How to observe superconductivity - Take Nb wire - Connect to a voltmeter and a current source - Put into helium Dewar - Measure electrical resistance T (K) R (Ohm) 10 300 A V Dewar with liquid Helium (4.2K) Nb wire R s Heike Kamerling Onnes. Meissner effect -the key signature of samples display the classic hallmarks of superconductivity: zero electrical resistance and a phenomenon known as the Meissner effect. Other hydrogen compounds may be good candidates for high-temperature superconductivity too. For instance, compounds that pair hydrogen with platinum, potassium, selenium or tellurium, instead of sulfur. Fundamentals of superconductivity 33 The critical magnetic ・'ld of a superconductor is found to vary with the tempera- ture. As the temperature is lowered, this value increases. Likewise, as the temperature is increased, the value of H c(T)decreases to zero at T c.The temperature dependenceof H c(T) is given by the general expression H c(T) ﾂｼ H Figure 5: Superconductivity is dest