On the occurrence of Berezinskii-Kosterlitz-Thouless behavior in highly anisotropic cuprate superconductors
arXiv:cond-mat/0702352 · doi:10.1209/0295-5075/78/47003
Abstract
The conflicting observations in the highly anisotropic Bi2Sr2CaCu2O8+x, vidence for BKT behavior emerging from magnetization data and smeared 3D-xy behavior, stemming form the temperature dependence of the magnetic in-plane penetration depth are traced back to the rather small ratio, gsic+/gsic-=0.45, between the c-axis correlation length probed above (+) and below (-) Tc, and the comparatively large anisotropy. The latter leads to critical amplitudes gsic0+,-which are substantially smaller than the distance between two CuO2 double layers. In combination with gsic+/gsic-=0.45 and in contrast to the situation below Tc the c-axis correlation length gsic exceeds the distance between two CuO2 double layers very close to Tc only. Below this narrow temperature regime where 3D-xy fluctuations dominate, there is then an extended temperature regime where the units with two CuO2 double layers are nearly uncoupled so that 2D thermal fluctuations dominate and BKT features are observable.
arXiv comment4 pages, 4 figures
References in corpus (16)
- Critical Phenomena and Renormalization-Group Theory
- Vanishing of phase coherence in underdoped Bi_2Sr_2CaCu_2O_8+d
- The onset of the vortex-like Nernst signal above Tc in La_{2-x}Sr_xCuO_4 and Bi_2Sr_{2-y}La_yCuO_6
- Field-enhanced diamagnetism in intense magnetic field in the pseudogap state of the cuprate $\rm Bi_2Sr_2CaCu_2O_{8+δ}
- Effects of carrier concentration on the superfluid density of high-T_c cuprates
- Correlation between superfluid density and Tc of underdoped YBa2Cu3O6+x near the superconductor-insulator transition
- Strongly nonlinear magnetization above in
- Systematic behaviour of the in-plane penetration depth in d-wave cuprates
- Electric field effect modulation of transition temperature, mobile carrier density and in-plane penetration depth in NdBa2Cu3O(7-delta) thin films
- Survival of the d-wave superconducting state near the edge of antiferromagnetism in the cuprate phase diagram
- Torque magnetometry on single-crystal high temperature superconductors near the critical temperature: a scaling approach
- Electrostatic Modulation of the Superfluid Density in a Ultrathin La2-xSrxCuO4 Film
- Universal properties of cuprate superconductors
- Probing inhomogeneities in type II superconductors by means of thermal fluctuations, magnetic fields and isotope effects
- Critical dynamics of superconducting BSCCO films
- Finite size effect in Bi2Sr2CaCu2O(8+d) and YBa2Cu3O6.7 probed by the in-plane and out of plane penetration depths