The Discovery of Type II Superconductors Part 4 potx

... concentration of boron. The decrease in R(λ) compared with the data of the silicon single crystal and the drops in the position of the peaks at the wavelengths of λ=3 54 and 275 nm are observed. The above ... al., 2004a; 2004b; 2005). Then, the fractal distribution has to be reproduced by increasing the time of the oxidation process, with the P b cente...

Ngày tải lên: 21/06/2014, 05:20

... 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 contained a significant amount of Ti, similar to the ... precipitate of NEG-211 seen in the right figure, two types of nanoparticles appear in the product, one within the size range 200-500 nm and another one of...

Ngày tải lên: 21/06/2014, 05:20

... +I, +II, +III Fe [Ar]3d 6 4s 2 +II, +III, +IV, +V Nb [Kr]4d 3 5s 2 +III, +V Pb [Xe]4f 14 5d 10 6s 2 6p 2 +II, +IV Ti [Ar]3d 2 4s 2 +II, +III, +IV Tl [Xe]4f 14 5d 10 6s 2 6p 1 +I, +III ... La(+III), Y(+III), Ba( +II) , Sr( +II) , Bi(+III), Ca( +II) , Tl(+III), Hg( +II) and O( -II) . We verify that the results predicted by the simple model proposed here are in good agreement...

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

... 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 ... a strong enhancement of H(10 4 ), the field at which J c takes the value 1 × 10 4 A cm −2 . For tapes subjected to 1 .48 GPa pressure, H(10 4 ) || and H(10 4 )...

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

... 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

... 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

... 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 errors in ... increase of the amount of doping, regardless of the nature of the dopants. The repression of superconductivity was concluded to be due to local disorder induced...

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 ... In the unconventional (high temperature) superconductors, the breaking of the Superconductor 276 diamond saw in the rectangular shape of 4x2x1 mm....

Ngày tải lên: 21/06/2014, 05:20