arXiv subjects

Z. H. Ning

Publications and source records attributed to Z. H. Ning.

3 recordsLinked to original sources

arXiv2005

Scaling of Nonlinear Longitudinal and Hall Resistivities near the Vortex Glass Transition

We show that the longitudinal current-voltage characteristics of superconductors in mixed state have the general form of extended power law. Isotherms simulated from this nonlinear equation fit the experimental I-V data of Strachan et al. [ Phys. Rev. Lett. {\bf 87}, 067007 (2001)]. We determine the average pinning force in the flux creep and strong pinning regime and discuss both the puzzling scaling behavior $ρ_{xy}\proptoρ_{xx}^β$ and a recently found new scaling relationship of nonlinear Hall resistivity $ρ_{xy}(T)$.

cond-mat.supr-con↗

arXiv2004

Critical Scaling of Extended Power Law I-V Isotherms near Vortex Glass Transition

In view of the question about the vortex glass theory of the freezing of disordered vortex matter raised by recent experimental observations we reinvestigate the critical scaling of high $T_c$ superconductors. We find that dc current-voltage characteristic of mixed state superconductors has the general form of extended power law which is based on the Ginzburg-Landau (GL) functional in the similar way as the vortex glass theory. Isotherms simulated from this nonlinear equation fit the experimental I-V data of Strachan et al.[Phys.Rev.Lett. 87, 067007 (2001)]. The puzzling question of the derivative plot for the I-V curves and the controversy surrounding the values of critical exponents are also discussed.

cond-mat.supr-con↗

arXiv2002

Scaling of ac Susceptibility and Nonlinear Response in High-temperature Superconductors

The magnetic ac susceptibility of high-temperature superconductors is shown to obey some scaling relations.We try to ananlyse this behavior within the framework of a common nonlinear response function of mixed state.The derived equations for critical current and ac susceptibility (x(T)) agree with the scaling relations of experimental data.

cond-mat.supr-con↗