1 - 10 of 15 articles
Thin films of YBaCuO have been grown using a PrBa2Cu3O7−x template with the caxis aligned in the plane of the films. Conductivity and hence paraconductivity have been measured along the c-axis direction on this plane. Thermal fluctuation studies have been attempted along this direction, and the...
Using the new method of breaking, the tunnel junctions with the (100) plane fracture surface could be obtained. The observed singularities in conductivity can be explained by tunneling between the different layers (CuO2→CuO2, sharp peaks at 2Δ
2→BiO, peaks at 100–140 mV; BiO→BiO,...
We present results concerning the effect of adding potassium and excess copper (1÷5 wt.%) to the initial powder Y(1-0.2x)Ba(2-0.2x)KxCu3Oy, (x=0÷0.95) on the a.c. complex susceptibility and the development of the microstructure within the YBCO high-temperature superconducting system. The a.c....
Double electron exchange between Cu4s and O2pσ orbitals is analyzed as mechanism which creates traditional cooper pairing in layered cuprates. The conductivity band is obtained in the oversimplified model which considers only hopping between O2pσ orbitals, and the amplitude of the Cu4s-O2pσ...
We consider the phonon-mediated BCS mechanism for superconductivity. We show that in a material with a very large ionic dielectric constant, the maximum Tc is increased by an order-of-magnitude over the value in “conventional” metals, for a 2-D metal. This model applies to cuprates and organic...
The characteristic enhancement in the heat conduction below Tc is analyzed on sintered YBa2Cu3O7 from viewpoints of both d-wave and s-wave coupling. Assuming the existence of a large energy gap Δ0(≥1.5Δ
), only d-wave coupling is consistent with experimental observation. It is found that the...
The strain of the C60 molecule in the polymeric-like phase was described. It is shown that a small rotation of the C60 molecule is possible at the phase transition. Numerical calculation of AC60 powder neutron diffraction spectra for the Fm3m phase was made.
We describe the details of a new method for studying thermally activated flux creep in superconductors. this method employs an array of microscopic Hall sensors to probe the time evolution of the field profile in the sample. We analyze these data on the basis of a continuity equation which takes...
High quality c-axis oriented films of the intriguing intermetallic superconducting compound YNi2B2C have been obtained “in situ” by magnetron sputtering on MgO substrates held at about 800°C. The films showed maximum Tc=15.3 K, †Tc≈0.1 K, room temperature resistivity ρ≈50μΩ·cm, critical current...
We have obtained superconducting Bi2Sr2CaCu2O8+x ceramic compounds with a grain structure that consists of needle-like particles of about 1.5 mm in length and 100 μm in diameter, which seem to be formed by flake-like small grains. The Bi(2212) compound has been prepared following the polymer...
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