Browsing by Author "Chi, Cheng"

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Concurrent intersection point of magnetization and magnetoconductivity curves in strongly fluctuating superconductors
(2017-12-20)
Chi, Cheng
;
Jiang, Xujiang
;
Wang, Jiangfan
;
Li, Dingping
;
Rosenstein, Baruch
The thermal fluctuations contribution to magnetization and magnetoconductivity of type-II layered superconductors is calculated in the framework of the Lawrence-Doniach model. For numerous high-temperature cuprate superconductors, it was discovered that the magnetization dependence on temperature in a wide range of fields exhibits an intersection point at a temperature slightly below Tc. We notice a similar intersection point of the magnetoconductivity curves at the approximate same temperature. The phenomenon is explained by strong (non-Gaussian) thermal fluctuations with interactions treated using a self-consistent theory. All higher Landau levels should be included. Dimensionality of the fluctuations is defined, and the two- to three-dimensional crossover is the key for the existence of intersection points.