The Discovery of Type II Superconductors Part 14 ppt

... are the same; hence the chalcogenides are rather similar. In particular, all of them consist of infinite one-dimensional chains, extended along the c-axis. One of the basic unit elements are the ... V ZZ the largest component of the crystal EFG tensor, η =|V XX - V YY |/V ZZ the asymmetry parameter showing the deviation of the EFG symmetry from the axia...

Ngày tải lên: 21/06/2014, 05:20

... 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...

Ngày tải lên: 21/06/2014, 05:20

... 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...

Ngày tải lên: 21/06/2014, 05:20

... Cu(+III) 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) . ... 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...

Ngày tải lên: 21/06/2014, 05:20

... 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 ... superconductivity, the experimental side of the discovery of these superconductors, as far as the author knows, having been discussed only fragmen...

Ngày tải lên: 21/06/2014, 05:20

... raises the question of whether the Josephson transitions dominate in the transfer of the pair of 2D holes in the plane of the nanostructured δ - barriers and in the proximity effect due to the ... 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 S...

Ngày tải lên: 21/06/2014, 05:20

... 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

... 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...

Ngày tải lên: 21/06/2014, 05:20

... 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 contain...

Ngày tải lên: 21/06/2014, 05:20

... was reported that the superconducting properties of these materials are affected with increase of the amount of doping, regardless of the nature of the dopants. The repression of superconductivity ... to study the Figure of merit of the ceramic superconductors. One of the important thermomagnetic transport quantities is the electrothermal conductivity...

Ngày tải lên: 21/06/2014, 05:20