Two types of Hc2(T) dependences in Bi_2Sr_2Ca_(1-x)Y_xCu_2O_(8+delta) with different Yttrium content
arXiv:cond-mat/0612031 · doi:10.1016/j.physc.2007.03.374
Abstract
We reanalyze the magnetization data collected on Bi_2Sr_2Ca_(1-x)Y_xCu_2O_(8+y) samples (Kim at al, Phys. Rev. B 72, 64525 (2005)) and argue that the method, which was used for the analysis of equilibrium magnetization data, is not adequate to the experimental situation. As a result, the temperature dependencies of the upper critical field Hc2(T) and the magnetic field penetration depth lambda (T), obtained in this work, are misinterpreted. Using a different approach to analysis, we demonstrate that the normalizedHc2(T) curves are rather different from those presented in the original publication and do not follow predictions of the Werthamer-Helfand-Hohenberg theory. Another important observation is that the Hc2(T) dependencies for two samples with different levels of doping are qualitatively different.
arXiv comment10 pages, 3 figures
References in corpus (9)
- Properties of the Ideal Ginzburg-Landau Vortex Lattice
- Inhomogeneous superconductivity and the "pseudogap state of novel superconductors
- Temperature dependence of the upper critical field of type-II superconductors from isothermal magnetization data. Application to high temperature superconductors
- Temperature dependence of the upper critical field of high-Tc superconductors from isothermal magnetization data. Application to polycrystalline samples and ceramics
- On the interpretation of the equilibrium magnetization in the mixed state of high-Tc superconductors
- Landau and Ott scaling for the kinetic energy density and the low conventional superconductors, and Nb
- Pinning Action of Correlated Disorder against Equilibrium Properties of HgBaCaCuO: a Delicate Balance
- Comment on "Enhanced two-dimensional properties of the four-layered cuprate high-Tc superconductor TlBa-2Ca-3Cu-4O-y"
- Scaling of the Equilibrium Magnetization in the Mixed State of Type-II Superconductors