2000/12/09 by B. Rosenstein, B. Ya. Shapiro, Rosenstein, B. +7
Physics and Astronomy · #FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con) #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0012151
RevTeX, 9 pages, 5 eps figures. Accepted in Phys. Rev. B
arxiv created 2000/12/09 · arxiv updated 2009/11/30
Magnetization measurements as a function of temperature are reported for YBa2Cu3O6.5 crystal (Tc=45.2 K) for fields between 0.2 to 3.5 Tesla. All isochamps for H>1 Tesla intersect at T2D⋆≃ 42.8 K, implying fluctuations contribution to the magnetization. These curves collapse into a single curve when magnetization and temperature are scaled according to the predicted ''2D scaling'' in the fluctuation regime. Surprisingly, the low field curves also intersect, at T3D⋆≃ 43.4 K, and they obey a 3D scaling. We provide a theoretical picture of the magnetization in the fluctuation regime based on the Lawrence-Doniach model. Within this model we calculate the field and temperature dependence of the magnetization. The two intersection points and the 2D→ 3D crossover are consistent with the experimental observation.