By A. Mourachkine
The most objective of the e-book is to offer an outline of the mechanism of high-temperature superconductivity and to debate the physics of high-temperature superconductors, either fullyyt in response to experimental evidence. The pairing mechanism of this extraordinary phenomenon relies on an anomaly present in tunneling (V) features of a few cuprates. by utilizing the soliton thought, it really is then proven that this anomaly is attributable to pairs of quasi-one dimensional excitations - bisolitons - sure as a result of a reasonably robust, nonlinear electron-phonon interplay. while, research of experimental facts unambiguously exhibits that magnetic (spin) fluctuations mediate the section coherence in cuprates. The mechanism of superconductivity in quasi-one dimensional natural superconductors and heavy fermions is mentioned too. In cuprates, the origins of 5 diverse energy/temperature scales are pointed out. eventually, 3 major rules of superconductivity are brought on the finish of the ebook. research of tunneling and angle-resolved photoemission measurements is gifted within the final bankruptcy. The booklet which incorporates three hundred pages with a hundred and eighty illustrations is addressed to researchers and graduate scholars in all branches of actual sciences.
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Extra info for High-Temperature Superconductivity in Cuprates: The Nonlinear Mechanism and Tunneling Measurements (Fundamental Theories of Physics)
The Abrikosov results showed that there are two types of superconducting materials: type I and type II. While the former expel magnetic flux completely from their interior, the latter do it completely only at small magnetic field magnitudes, but partially in higher external fields. With the exception of Nb and V, all superconducting elements and most of their alloys are type-I superconductors. As schematically shown in Fig. 10, the variation of the critical field with temperature for a type-I superconductor is approximately parabolic: 22 HIGH-TEMPERATURE SUPERCONDUCTIVITY IN CUPRATES where is the value of the critical field at absolute zero.
The interaction mediated by the background crystal lattice can crudely be pictured as follows. An electron tends to create a slight distortion of the elastic lattice as it moves, because of the Coulomb attraction between the negatively charged electron and the positively charged lattice. If the distortion persists for a brief time, a second passing electron will feel the distortion and be affected by it. Under certain circumstances, this can give rise to a weak indirect attractive interaction between the two electrons which may more than compensate their Coulomb repulsion.
As one can see in Fig. 17a, the calculated density of states has two specific features which are present for any it is not zero at zero bias, and displays the presence of a “knee” at low bias. 17b shows the conductance curve dI/dV measured in a Pb-insulator-Pb junction. In Fig. 17, one can see that the correspondence between the two curves is poor (see also Fig. 4(a) in ). This issue has not been discussed in the literature to date. We shall return to this question in Chapter 12. 4 The Josephson product The magnitude of the zero-voltage current resulting from the tunneling of Cooper pairs, known as the Josephson effect, depends on the phase difference between two superconductors as where is the phase difference, and is the critical Josephson current.