منابع مشابه
ac response of Hg-based superconductors: Surface barrier and bulk pinning contributions
A complete study of the ac response of Hg-based superconductors with 1, 2, and 3 Cu-O planes is presented. Under a dc field, the ac susceptibility xac(T) displays a double transition, which is argued to be of intrinsic nature. The systematic analysis of the evolution of xac ~fundamental and higher harmonics! as a function of the experimental parameters, and the comparison with resistance and dc...
متن کاملVortex liquid crystals in anisotropic type II superconductors.
In an isotropic type II superconductor in a moderate magnetic field, the transition to the normal state occurs by vortex lattice melting. In certain anisotropic cases, the vortices acquire elongated cross sections and interactions. Systems of anisotropic, interacting constituents generally exhibit liquid crystalline phases. We examine the possibility of a two step melting in homogeneous type II...
متن کاملDual Symmetry in Bent-Core Liquid Crystals and Unconventional Superconductors
We extend the Landau theory of bent-core mesophases and d-wave high-Tc superconductors by considering additional secondary pseudo-proper order parameters. These systems exhibit a remarkable analogy relating their symmetry groups, lists of phases, and an infinite set of physical tensors. This analogy lies upon an internal dual structure shared by the two theories. We study the dual operator tran...
متن کاملInternal Friction of Flux Motion in Hg-System High-Tc Superconductors
The internal fiiction(F) and modulus as hnctions of temperature were measured for several Hg-system high-Tc superconductors(Hgl201, Hg1223, Hg1223 doped with Fe and Pb), under the applied magnetic field, with vibrating reed technique. An IF peak associated with flux motion can be found below Tc for all samples. The temperature of the IF peak increases with reducing vibrating amplitude. This amp...
متن کاملSystematic resistivity study of the pseudogap and critical temperature for ( Hg , Re ) - 1223 superconductors
After a detailed characterization of the (Hg,Re)-1223 polycrystalline samples, the pseudogap temperature T ∗, fluctuation temperature Tscf and the superconducting critical temperature Tc have been systematically studied through electrical resistivity ρ measurements by several different current densities. Performing many set of measurements with different current densities we show that, while lo...
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ژورنال
عنوان ژورنال: Nature
سال: 1994
ISSN: 0028-0836,1476-4687
DOI: 10.1038/371661a0