نتایج جستجو برای: critical current density superconductivity
تعداد نتایج: 1577042 فیلتر نتایج به سال:
(YGdSm)123 sample with nominal composition (Y0.33 Gd0.33 Sm0.33 )Ba 2 Cu 3 O X ,also YGdEu1 and YGdEu2 samples with nominal composition (Y0.33 Gd0.33 Eu0.33 )Ba2 Cu3 OX were prepared at different oxygenation conditions. All the samples were analysed by ac susceptibility , resistivity , critical current density (Jc), SEM,XRD and EDX. The critical current density measurements show that the Jc i...
چکیده ندارد.
Charge density wave (CDW), the periodic modulation of the electronic charge density, will open a gap on the Fermi surface that commonly leads to decreased or vanishing conductivity. On the other hand superconductivity, a commonly believed competing order, features a Fermi surface gap that results in infinite conductivity. Here we report that superconductivity emerges upon Se doping in CDW condu...
for an Invited Paper for the MAR10 Meeting of The American Physical Society Tuning the Quantum Stability and Superconductivity of Ultrathin Metal Alloys1 HANNO WEITERING, The University of Tennessee Superconductivity is inevitably suppressed in reduced dimensionality. In this talk, I will show how quantum confinement of itinerant electrons in a soft metal, Pb, can be exploited to stabilize atom...
In previous work on undoped MFe(2)As(2), partial drops in the resistivity indicative of traces of superconductivity have been observed for some samples with M = Ba (T(c)∼20 K, up to 25% drop in ρ) and M = Ca (T(c)∼10 K, up to 45% drop in ρ). A complete drop in the resistivity to ρ = 0, along with a finite fraction of Meissner flux expulsion, has been observed for M = Sr, T(c) = 22 K. Using I...
In this paper, the CdO nanoparticles were prepared by chemical reduction method. Then, the CdO nanoparticles were doped in the Bi1.64Pb0.36Sr2Ca2-xCdxCu3Oy with x = 0.0, 0.01, 0.02, 0.03, 0.04, 0.1 superconductor. The samples were synthesized by the standard solid-state reaction technique. The structural properties, microstructure and morphology of the samples have been studied by XRD, SEM a...
We expand the well-known notion that quantum criticality can induce superconductivity by proposing a concrete mechanism for superconductivity due to quantum ferroelectric fluctuations. To this end, we investigate the origin of superconductivity in doped SrTiO_{3} using a combination of density functional and strong coupling theories within the framework of quantum criticality. Our density funct...
We report on the emergence of robust superconducting order in single crystal alloys of TaSe2−xSx (0≤ ×≤ 2). The critical temperature of the alloy is surprisingly higher than that of the two end compounds TaSe2 and TaS2. The evolution of superconducting critical temperature Tc(x) correlates with the full width at half maximum of the Bragg peaks and with the linear term of the high-temperature re...
The critical temperature Tc and the critical current density Jc determine the limits to large-scale superconductor applications. Superconductivity emerges at Tc. The practical current-carrying capability, measured by Jc, is the ability of defects in superconductors to pin the magnetic vortices, and that may reduce Tc. Simultaneous increase of Tc and Jc in superconductors is desirable but very d...
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