The new high temperature superconductors
نویسندگان
چکیده
منابع مشابه
Are the New High Temperature Superconductors Strong Coupling Systems?*
Under certain circumstances the excitations of a superconductor will not be those predicted by BCS theory, but rather electron bag states. A variational calculation is used to establish this regime in which such collective states form. The fact that such bags may bind more than one electron implies the existence of more than one peak in the plots of dl/dV versus Vp obtained in Giaver tunneling ...
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In this paper, we present a new discrete formulation that maintains discrete invariance and is suitable for use on nonorthogonal meshes. This formulation, unlike its predecessors , allows us to easily use adaptive mesh reenement to concentrate grid points where error contributions are large (near vortex centers). In this way we reduce the total number of grid points required to accurately captu...
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In this paper we discuss several new techniques used for the simulation of high-temperature superconductors on parallel computers. We introduce an innovative methodology to study the eeects of temperature uctu-ations on the vortex lattice connguration of these materials. We have found that the use of uniform orthogonal meshes results in several limitations. To address these limitations, we cons...
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A review of relevant experiments that favour an unconventional pairing symmetry in high temperature cuprates is made. Results of magnitude sensitive techniques are discussed and then tests which probe directly the phase of the order parameter are presented in more detail. Josephson eeect and its relevance to this problem is described. Consensus resulting from compelling arguments for a d x 2 ?y...
متن کاملVortex charges in high-temperature superconductors.
Based on a model Hamiltonian with competing antiferromagnetic (AF) and d-wave superconductivity interactions, the vortex charge is investigated by solving the Bogoliubov-de Gennes equations. We found that the vortex charge is negative when a sufficient strength of AF order is induced inside the vortex core; otherwise, it is positive. By tuning the on-site Coulomb repulsion U or the doping param...
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ژورنال
عنوان ژورنال: IEEE Transactions on Nuclear Science
سال: 1988
ISSN: 0018-9499
DOI: 10.1109/23.12666