نتایج جستجو برای: superconducting energy gap
تعداد نتایج: 812569 فیلتر نتایج به سال:
for an Invited Paper for the MAR10 Meeting of The American Physical Society Structure, magnetic order and excitations of the Fe(Se,Te) superconductor system WEI BAO, Department of Physics, Renmin University of China The Fe(Se,Te) material, instead of being chalcogen deficient as initially proposed, in general has excessive Fe at an interstitial site [1]. It shares the similar ferminology of the...
We present the first detailed data of the momentum-resolved, temperature dependence of the superconducting gap of Bi 2 Sr 2 Ca 1 Cu 2 O 8+x , complemented by similar data on the intensity of the photoemission superconducting conden-sate spectral area. The gap anisotropy between the Γ− ¯ M and Γ−X directions increases markedly with increasing temperature, contrary to what happens for conventiona...
In exotic superconductors, including high-Tc copper oxides, the interactions mediating electron Cooper pairing are widely considered to have a magnetic rather than a conventional electron-phonon origin. Interest in this exotic pairing was initiated by the 1979 discovery of heavy-fermion superconductivity in CeCu2Si2, which exhibits strong antiferromagnetic fluctuations. A hallmark of unconventi...
Within the kinetic energy driven superconducting mechanism, the effect of the pressure on superconductivity in the doped two-leg ladder cuprates is studied. It is shown that the superconducting transition temperature in the doped two-leg ladder cuprate superconductors increases with increasing pressure in the underpressure regime, and reaches a maximum in the optimal pressure, then decreases in...
We study a chain of magnetic moments exchange coupled to a conventional three-dimensional superconductor. In the normal state the chain orders into a collinear configuration, while in the superconducting phase we find that ferromagnetism is unstable to the formation of a magnetic spiral state. Beyond weak exchange coupling the spiral wave vector greatly exceeds the inverse superconducting coher...
We have studied the thermally activated flux creep of a newly fabricated superconductor Y3Ba5Cu8O18 with the superconducting transition temperature 102 K. Analysis of the transition spread from the normal state to superconducting state in the electrical resistivity revealed that the thermally activated flux creep explains the electron share in the vicinity of the transition temperature Tc. The ...
We calculate the density of states of electron-hole excitations in a superconductor–normal-metal– superconductor SNS junction in graphene, in the long-junction regime that the superconducting gap 0 is much larger than the Thouless energy ET= v /d with v the carrier velocity in graphene and d the separation of the NS boundaries . If the normal region is undoped, the excitation spectrum consists ...
In this work we analyze impact of non-adiabatic effects on the superconducting energy gap in hole-doped graphene. By using Eliashberg formalism beyond Migdal's theorem, present that strongly influence exemplary boron-doped particular, effects, as represented by first order vertex corrections to electron-phonon interaction, supplement Coulomb depairing correlations and suppress state. summary, o...
The nature and behavior of electronic states in high temperature superconductors are the center of much debate. The pseudogap state, observed above the superconducting transition temperature Tc, is seen by some as a precursor to the superconducting state. Others view it as a competing phase. Recently, this discussion has focused on the number of energy gaps in the system. Some experiments indic...
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