[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] We present measurements of the local magnetization in high-temperature super- conductors, focusing attention to dynamic and thermodynamic transitions in their magnetic phase diagram. In particular, local electric field vs. current density (E-j) curves were measured in YBa₂Cu₃O_7-d and Nd_1.85Ce₀₁₅CuO_4-d single crystals using a miniature Hall-sensors array. Measurements in the field range corresponding to the anomalous magnetization peak in these crystals, reveal remarkably different E-j characteristics below and above the peak, indicating a crossover in the flux creep mechanism. Similar E-j behavior, as observed here in YBa₂Cu₃O_7-d and Nd_1.85Ce_0.1₅CuO_4-d, is expected universally in every superconductor exhibiting the anomalous peak