The Discovery of Type II Superconductors Part 6 doc

... MgB 2 . The parameters of Raman spectra vary with the composition of MgB 2 crystals and the influence of their surroundings, which depends on both the connectivity and the disorder of the ... −− ⎣ ⎦ (7) with Z k being the atomic number of the k-atom, r 0 is the electron classic radius, α = Z k /137, β is the ratio of the electron velocity to the...

Ngày tải lên: 21/06/2014, 05:20

... size of the superconductors and the length of the c-axis of the unit cell of the system are highly effective on both of the first and second chaotic points of the superconducting system. 2. The ... Vol. 3 76, Iissue 3 133-223, ISSN: 0370-1573. Nambu Y. (1 960 ). Quasi-particles and gauge invariance in the theory of superconductivity. Phys Rev., Vol. 117 I...

Ngày tải lên: 21/06/2014, 05:20

... ions. For the other elements in Table 3, we have considered the following stable oxidation states: La(+III), Y(+III), Ba( +II) , Sr( +II) , Bi(+III), Ca( +II) , Tl(+III), Hg( +II) and O( -II) . We verify ... Cu(+III). Metal Electron configurations Oxidation states As [Ar]3d 10 4s 2 4p 3 +III, +V Bi [Xe]4f 14 5d 10 6s 2 6p 3 +III, +V Cu [Ar]3d 10 4s 1 +I, +II, +III Fe [Ar]3d 6...

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... reversible, the hysteresis rather small. 5. The difference in free energy of magnetized and normal superconductors was given by the area of the curve: ΔF = ∫МdH, The Discovery of Type II Superconductors ... The reversible magnetization curve of a long cylinder of Type I and Type II superconductor (After De Gennes, 1 966 ) In Type II superconducto...

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... restricted to 2 nm. Therefore, the distribution of the microdefects created at the initial stage of the oxidation seems to represent the fractal of the Sierpinski Gasket type with the built-in self-assembled ... Nevertheless, the mechanism of the bipolaronic transfer is still far from completely clear. This raises the question of whether the Josephson tra...

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... Energies of particles were selected considering the optimisation of nuclear reaction of the projectile with the sample and the range of particles in the sample. In case of HTSC Bi-cuprates, the purpose ... Fig. 6b. The contribution of the Cu-O 2 planes was considered, taking together the effects on the oxygen and the copper atoms in those sites. The res...

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... slowly in case of B implying lower slope of J c -B curve for sample B. The lower values of the exponents k and m of the irradiated sample show that there is reduction of the distance of the pinning ... matrix of intensity values, I(r), associated with the intensity of the interference at each point of the image. The characteristics of the CCD camera...

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... deformation of 2.2 μm (8 fringes) and a minimum one of approximately 0. 56 μm (2 fringes) in the right part of the sample. In the rest of the images, the sample deformation leads to the expected ... decomposition of LRE-123 in the partial-melted region during the melt-texturing process. On the other hand, the small round particles of 20-50 nm size conta...

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... uniformity or on the shapes, packing and alignment of the regions and/or pores of the size larger than the resolution. Further development of the technique and improvement of the resolution is ... amount of the brighter regions is likely to enhance from A to D and, hence, the amount of the high density regions in the material is enhancing. At the same tim...

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... consideration the limitations of the theory of the technique and the experimental sampling errors, the thermal conductivity and thermal diffusivity data contain errors of 4% and 7% respectively. The ... was reported that the superconducting properties of these materials are affected with increase of the amount of doping, regardless of the nature of the...

Ngày tải lên: 21/06/2014, 05:20