The Discovery of Type II Superconductors Part 7 pptx

... 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

... 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 with the experimental ... coherence length is of the order of the distance between two atoms, the order of magnitude of the width of the insulator film should be about one angstr...

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

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... 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...

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... 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 ... 2} k k PKA rZ E π στβτπαβττ βγ ⎡ ⎤ =⋅−− ± −− ⎣ ⎦ (7) with Z k being the atomic number of the k-atom, r 0 is the electron classic radius, α = Z k /1 37, β is the r...

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

... 0 50 100 150 012345 67 65 K 68 K 70 K 73 K 75 K 77 K 80 K 82 K 84 K 86 K 88 K 90 K H a (T) μ 0 0.35 mol% TiO 2 Fig. 9. Field dependence of the super-current density of the NEG-123 samples with the same, ... 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 image...

Ngày tải lên: 21/06/2014, 05:20

... 0 0.2 0.4 0.6 0.8 1 70 K 73 K 75 K 77 K 78 K 80 K 82 K 84 K 86 K 88 K 90 K 0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 1 65 K 68 K 70 K 73 K 75 K 77 K 80 K 82 K 84 K 86 K 88 K 90 K 0 0.2 0.4 0.6 0.8 1 65 K 68 K 70 K 73 ... 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 te...

Ngày tải lên: 21/06/2014, 05:20

... 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 ... amount of doping, regardless of the nature of the dopants. The repression of superconductivity was concluded to be due to local disorder induced by 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 ... by the plastic forming method was a superconducting material. 270 370 334 366 443 3 57 345 253 (a) 73 0 74 0 880 8 87 713 75 1 890 670 79 0...

Ngày tải lên: 21/06/2014, 05:20