New PDF release: A semilinear Schrödinger equation in the presence of a

By Arioli G., Szulkin A.

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But it turns out that inclusions of Y-211 within the Y-123 significantly enhance the critical current density. That means that these precipitates or, more precisely, the lattice distortions around them serve as efficient pinning centers. Owing to the short coherence length in this material it is better to have very small submicron-sized precipitates which are homogeneously distributed throughout the sample. The goal of all melt growth processes therefore is to prepare large, monodomain mixed crystals of Y-123 and Y-211 where the Y-211 inclusions are of submicron size and finely dispersed in order to achieve high critical current densities.

As a consequence the density of states at the band edge is no longer singular but steadily goes to zero towards the middle of the band gap. Some very convincing experiments on the symmetry of the order parameter have been performed by Tsuei and coworkers on tricrystals of Bi2 Sr2 CaCu2 O8 and YBa2 Cu3 O7−δ [258]. The results show that, depending on the material, the wave function can have pure d-wave or a mixture of s- and d-wave symmetry. But an unambigious experimental proof of one or the other mechanism is still missing.

The silver sheath of a PIT conductor adds one more component to the multiphase system. Two facts are fairly well known. The first is that silver 44 3. d. 870 3 4 860 2212 + Ag 850 0 10 20 30 40 50 Mol-% Ag 1 liquid + Ca2CuO3 + (Sr,Ca)CuO2 + (Sr,Ca)3Bi2O8 2 liquid + (Sr,Ca)CuO2 + (Sr,Ca)3Bi2O6 3 2212 + liquid + (Sr,Ca)CuO2 + (Sr,Ca)3Bi2O6 4 2212 + liquid + Ca2CuO3 + (Sr,Ca)CuO2 Fig. 27. Pseudobinary phase diagram of Bi-2212–Ag as a function of temperature [182] is dissolved in Bi-2212 and Bi-2223; the second is that the silver addition significantly lowers all reaction temperatures, especially the melting points of both phases, by about 20◦ C.

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A semilinear Schrödinger equation in the presence of a magnetic field by Arioli G., Szulkin A.


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