High-temperature superconductivity

About: High-temperature superconductivity is a research topic. Over the lifetime, 7263 publications have been published within this topic receiving 175377 citations. The topic is also known as: high-temperature superconductivity.

Dynamics of magnetic fluctuations in high-temperature superconductors

Abstract: A Neutron Scattering- Antiferromagnetic Spin Fluctuations in Cuprate Superconductors- Neutron Scattering Measurements of the Magnetic Excitations of High-Temperature Superconducting Materials- Neutron Scattering Study of the Spin Dynamics in YBa2Cu3O6+x- Disordered Low Energy Component of the Magnetic Response in Both Antiferromagnetic and Superconducting Y-Ba-Cu-O Samples- B NMR- Copper and Oxygen NMR Studies On The Magnetic Properties of YBa2CuO7-y- 17O and 63Cu NMR Investigation of Spin Fluctuations in High Tc Superconducting Oxides- Local Hyperfine Interactions of Delocalized Electron Spins: 205TI Investigations in Tl Containing High Tc Superconductors- Weak Coupling Analysis of Spin Fluctuations In Layered Cuprates- Influence of the Antiferromagnetic Fluctuations On The Nuclear Magnetic Resonance In The Cu-O High Temperature Superconductors- Microscopic Models for Spin Dynamics in the CuO2 Planes with Application to NMR- C SR- Recent Topics OF SR Studies Of High-Tc Systems- Recent Results In The Application Of SR To The Study Of Magnetic Properties Of High-Tc Oxides- On the phase diagram of bismuth based Superconductors- D Raman Scattering- Raman scattering from spin fluctuations in cuprates- E Photoemission- Electronic structure of Bi2Sr2CaCu2O8 single crystals at the fermi level- Calculation of the photoemission spectra for the t-J model and the extended hubbard model- F Macroscopic Fluctuations- Microwave absorbtion of superconductors in low magnetic fields- Magnetic properties of a granular superconductor- G Transport Properties- Thermodynamic fluctuations and their dimensionality in ceramic superconductors out of transport properties measurements- H General Theory- Models Of High Temperature Superconductors- BSC Theory Extended To Anisotropic And Layered High-Temperature Superconductors- Correlated Electron Motion, Flux States And Superconductivity- Orbital Dynamics And Spin Fluctuations In Cuprates- Magnetic Frustration Model And Superconductivity On Doped Lamellar CuO2 Systems- I One Band Hubbard Models- Strong Coupling Regime In The Hubbard Model At Low Densities- How Good Is The Strong Coupling Expansion Of The Two Dimensional Hubbard Model- The Hubbard Model For n ? 10: New Preliminary Results- J Heisenberg Model Dynamics- Exact Microscopic Calculation Of Spin Wave Frequencies And Linewidths In The Two Dimensional Heisenberg Antiferromagnet At Low Temperature- Magnetic Excitations In The Disordered Phase Of The 2-D Heisenberg Antiferromagnet- K Quasiparticles and Magnetic Fluctuations- Exact Diagonalization Studies Of Quasiparticles In Doped Quantum Antiferromagnets- Copper Spin Correlations Induced By Oxygen Hole Motion- Spin Polarons In The t-J Model- Analytic Evaluation Of The 1-Hole Spectral Function For The 1-D t-J Model In The Limit J ?- Doping Effects On The Spin-Density-Wave Background- L Magnetic phases- Phase Separation In A t-J Model- Spiral Magnetic Phases As A Result Of Doping In High Tc Compounds

Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3(110)

Abstract: We report high temperature superconductivity in one unit-cell (1-UC) FeSe films grown on STO(110) substrate by molecular beam epitaxy. By in-situ scanning tunneling spectroscopy measurement, we observed a superconducting gap as large as 17 meV. Transport measurements on 1-UC FeSe/STO(110) capped with FeTe layers reveal superconductivity with an onset TC of 31.6 K and an upper critical magnetic field of 30.2 T. We also find that the TC can be further increased by an external electric field, but the effect is smaller than that on STO(001) substrate. The study points out the important roles of interface related charge transfer and electron-phonon coupling in the high temperature superconductivity of FeSe/STO.

Spin excitations and superconductivity in cuprate oxide and heavy electron superconductors

Abstract: The experimental evidence for a temperature-dependent build up of antiferromagnetic correlations between Cu 2+ planar spins in the normal state of cuprate oxide superconductors is reviewed, and a phenomenological one-component model, developed in collaboration with A. Millis and H. Monien, which appears capable of providing a quantitative account of existing experiments is described. A scaling law which relates the superconducting transaction temperature to the measurable spin-spin correlation length is proposed. The NMR experimental results in the superconducting state are shown to be consistent with d-wave pairing in a strong coupling superconductor. Comparison of the results of NMR experiments on the cuprate oxide and heavy electron superconductors reveals striking similarities. I conclude that the cuprate oxide superconductors are unconventional superconductors in which the superconductivity is of (primarily) electronic origin and results from an attractive interaction of antiferromagnetic character between itinerant quasiparticles in the spin antisymmetric channel, and discuss similarities and differences between cuprate oxide and heavy electron systems.

Lorentz-force-independent dissipation in high-temperature superconductors

Abstract: The evolution of resistivity in the mixed state of high-Tc superconductors has been a source of debate in the fundamental problem of whether or not energy dissipation originates from the Lorentz-force-driven flux motion. The conventional flux-creep and flux-flow models are essentially based on this mechanism and have frequently been used to explain the broad resistive transition in magnetic fields in high-Tc superconductors. However, recent intensive experimental studies of high-quality single crystals, such as (La1-xSrx)2CuO4, YBa2Cu3O4, Bi2Sr2CaCu2O8+ delta , etc, have revealed clear evidence that excludes the contribution of the effect of flux motion to the resistivity broadening, indicating that the conventional flux-motion mechanism does not play a major role in dissipation in high-Tc superconductors. Instead, mechanisms that take into account the superconducting fluctuation effect in the superconducting order parameter have recently been proposed and have successfully been applied to analyse experimental results. Possible similarities between the fundamental concepts of superconducting fluctuation models and the Kosterlitz-Thouless transition have also been discussed.

Superconductivity and Spin Density Wave in Two Dimensional Hubbard Model

Abstract: An interplay between the superconductivity and spin density wave (SDW) is studied from the perturbative point of view based on the two dimensional Hubbard model. It is shown that the d-pairing superconductivity is induced by spin fluctuations near the SDW boundary. The superconducting transition temperature ( T c ) is found to be remarkably suppressed by the renormalization through the electron self-energy, and to be sensitive to the band parameters due to nesting of the Fermi surface and the presence of the van Hove singularity as well as to the Fermi energy and the on-site interaction. As a consequence T c is enhanced by the next-nearest-neighbour hopping integral. The relation between the present result and experiments of high T c superconductors is discussed.