Oscillating paramagnetic Meissner effect and Berezinskii-Kosterlitz-Thouless transition in cuprate superconductor (IMAGE)
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a. Vortices in three-dimensional superconductors; b. Vortices in the two-dimensional limit have characteristic scales that exceed the size of the sample; c. Magnetic susceptibility imaging of single-layer Bi2Sr2CaCu2O8+δ; d. In the critical temperature region near the transition temperature Tc = 64 K, a paramagnetic peak appears in the susceptibility of the single-layer and oscillates with an external field; e. The width of the paramagnetic peak increases with temperature, indicating that vortex-antivortex pairs are gradually separated, leading the system to undergo a Berezinskii-Kosterlitz-Thouless (BKT) transition.
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