[en] An intuitive description is given of a phenomenological model for the formation of Cooper pairs in cuprate superconductors. In this model, coupling is mediated by large lattice strains connected to anharmonic oscillations along c of the apical ions. A pair binding energy of the order of several hundred kelvin was obtained. (orig.)

No abstract available

[en] Some aspects of High-Tc superconductivity (HTSC), witch may be successfully applied to the detection of particles and radiation are discussed. The perspectives of creation of radically new type detectors of particles and radiation, based on HTSC materials are considered. Capabilities of these detectors are evaluated and real directions of further essential improvement of their parameters are suggested. 17 refs

[en] Separate abstracts were prepared for 17 of the papers in this volume

[en] Short communication

[en] Short communication

[en] High-resolution angle resolved photoemission measurements were preformed on single crystals of Bi₂Sr₂Ca₁Cu₂O_8+δ with different oxygen stoichiometries. The data establish that the gap anisotropy (ration of the gap along Γ-M to the gap along Γ-X) can be reversibly changed from ∝ 20:1 (optimal or underdoped) ∝ 2:1 (overdoped). Differences in sample doping explain the conflicting reports in gap anisotropy in the literature. Possible effects if this change in gap anisotropy on the symmetry of the order parameter are discussed. There remains some ambiguity as to the relation between the order parameter and doping. 21 refs., 3 tabs

[en] Short communication

[en] Superconductivity is the flow of current free of loss. The application spectrum of this technology is enormous. This technology is already in use in research and in the medical field. Researchers still are on the quest for further materials with a high transition temperature. It is decisive that these materials are easily to be processed and that they have the necessary mechanical properties. (orig.)

[en] During the melt processing of superconducting wires and tapes a number of partial liquid phase regions are entered, and the type and amount of second phases that exist in the melt before cooling are critical in determining the microstructure of the final material. Decomposition pathway of Bi₂Sr₂CaCu₂O_x(Bi2212) with 0, 2, and 10 wt% Ag added was examined at 1 bar PO₂ by performing SAME/EDS analysis on oil quenched samples. A variety of quaternary phase diagrams were constructed to describe the evolution of the phase assemblage with temperature. At all Ag contents, Bi2212 first undergoes a peritectic reaction producing (Sr_1-xCa_x)₁₄Cu₂₄O₄₁(14,24), Bi₂(Sr_1-xCa_x)₄O_x(24x), and liquid