BCS theory of superconductivity

The properties of the asymmetric superconductors have been an exciting subject since the advent of the BCS theory of superconductivity more than four decades ago. While the early studies were motivated by the effects of the para-... 

The classical tunneling experiment of Giaever (1960) provided unambiguous proof of the BCS theory of superconductivity. The STM as a local tunneling probe is certainly suitable to probe the local properties of superconductors, such as the local structure of the Abrikosov flux lattice. The work of Hess and co-workers (1989, 1990, 1990a, 1991) is a prominent example. 

In the Bardeen-Cooper-Schrieffer (BCS) theory of superconductivity the transition temperature Tc strongly increases with At(Ep) ... 

It follows that the evaluation of the extent to which one-dimensional physics is relevant has always played an important part in the debate surrounding the theoretical description of the normal state of these materials. One point of view expressed is that the amplitude of in the b direction is large enough for a FL component to develop in the ab plane, thereby governing most properties of the normal phase attainable below say room temperature. In this scenario, the anisotropic Fermi liquid then constitutes the basic electronic state from which various instabilities of the metallic state, like spin-density-wave, superconductivity, etc., arise [29]. Following the example of the BCS theory of superconductivity in conventional superconductors, it is the critical domain of the transition that ultimately limits the validity of the Fermi liquid picture in the low temperature domain. 

Here we present a brief review of the essential aspects of the BCS theory of superconductivity which was introduced in 1957 and is still the most successful and complete theory of superconductivity which exists. The purpose of this section is to stress the unique features of the superconducting wave function which should be preserved in any new theory which involves a different mechanism for obtaining the ground state wave function. 

To summarize, the BCS theory of superconductivity provides an energy gap and a physical mechanism to achieve (1) phase coherence in the wave function and (2) an attractive interaction. Both of these are required to produce a gap as seen in the discussion of the Introduction. The BCS mechanism of pairing electrons with k and -k momenta is the key to accomplishing these goals. 

Aluminum oxide, as stabilizer, 296 Anderson model of superconductivity, 2 Anisotropic conduction, oxides, 40 Anisotropic GL theory, to ana superconductors. 19 Ann type, effect on cell parameters and magnetic properties, 142 Annealing parameters, films, 238,24(y Applications, BCS theory of superconductivity, 114 Argon laser-etched patterns, thin films, 257-25Atomic structure LajCuO, 27,2, 29 orthorhombic Y-Ba-Oi-0,27,2 ... 

In the framework of the so-called mean-field theory, in which the fluctuations in the 1-d metal lattice are neglected, the energy gap 2A = 0 for T > Tp. Below the energy gap opens continuously with decreasing temperature, analogously to the BCS theory of superconductivity, and at T - 0, it has the value... 

According to the BCS theory of superconductivity, the electronic term of the heat capacity in the super conducting state can be expressed as CBslyTc = fit). 

Books, 1988. John Schrieffer was one of the Nobel laureates who developed the BCS theory of superconductivity, and this introduction, considered as one of the best in the field, profits from his experience and expertise. 

In the following we provide first a simple thermodynamic treatment of the superconducting transition, which sheds some light onto the behavior of the physical system, and then we give an elementary account of the BCS theory of superconductivity. We conclude this section with a short discussion of the high-temperature superconductors and their differences from the conventional ones. 

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