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We report measurements of the dependence on magnetic field and array size of the resistive transition of Josephson junction arrays with long-range interaction. Because every wire in these arrays has a large number of nearest neighbors (9 or 18 in our case) ...
Iodine intercalation in Bi2Sr2CaCu2Oy crystals enables one to modify the critical temperature, T(c), of the superconducting phase, and to obtain a semiconductor phase. This doping drastically changes the size of the unit cell. A photoemission spectroscopy ...
We study the phase transition in SU(2)-Higgs model on the lattice using the 3D dimensionally reduced formalism. The 3D formalism enables us to obtain highly accurate Monte Carlo results, which we extrapolate both to the infinite volume and to the continuum ...
We calculate the one-electron Green's function of the two-dimensional (2D) attractive Hubbard model by coupling the electrons to pair fluctuations. The latter are approximated by homogeneous amplitude fluctuations and phase correlations corresponding to th ...
Using high energy resolution angle-resolved photoemission, we have measured both the superconducting gap and the photoemission superconducting condensate spectral area of Bi2Sr2Ca1Cu1O8+x as a function of temperature in two different locations of the Brill ...
Detailed data on the momentum-resolved temperature dependence of the superconducting gap of Bi2Sr2CaCu2O8+x are presented, complemented by similar data on the intensity of the photoemission superconducting condensate spectral area. The gap anisotropy betwe ...
We present measurements for the resistivity of `c' axis oriented YBa2Cu3O7-δ (YBCO) films grown on (100) SrTiO3 substrates by both laser ablation and ion beam sputtering. The effect of the magnetic field on the resistivity is investigated with the field pa ...
The microchemical composition and the electronic structure of the two superconductors HgBa2Ca2Cu3O8+delta(Hg-1223) and HgBa2CaCu2O6+delta (Hg-1212) were analyzed with the technique of photoemission with high spatial resolution. This enabled primary spectra ...
Photoemission spectromicroscopy experiments on a series of Y-doped Bi2Sr2Ca1Cu2O8 single crystals show that the doping changes the valence of copper as required for the observed modification of the critical temperature. The doping, however, affects with su ...
We find that even very low Ni doping levels of high-quality Bi2Sr2Ca1Cu2O8 single crystals strongly affect the transition temperature T(c). We also observed that T(c) is not related to the total Ni concentration, but only to that of Ni engaged in NiO-type ...
