Doping dependence of the vortex-core energy in bilayer films of cuprates

Details Doping dependence of the vortex-core energy in bilayer films of cuprates Doping dependence of the vortex-core energy in bilayer films of cuprates

2007-12-06

arxiv.org/abs/0712.0936v2

Phys. Rev. B 77, 100506(R) (2008)

Physics

Condensed Matter

Superconductivity

4pages, 3 figures. References added, final version

Scientific paper

10.1103/PhysRevB.77.100506

The energy needed to create a vortex core is the basic ingredient to address the physics of thermal vortex fluctuations in underdoped cuprates. Here we theoretically investigate its role on the occurrence of the Beresinskii-Kosterlitz-Thouless transition in a bilayer film with inhomogeneity. From the comparison with recent measurements of the penetration depth in two-unit cell thin films of Y$_{1-x}$Ca$_{x}$Ba$_{2}$Cu$_{3}$O$_{7-\d}$ (YBCO) by Hetel et al. [Nat. Phys. 3, 700 (2007)] we can extract the value of the vortex-core energy $\mu$, and show that $\mu$ scales linearly with $T_c$ at low doping.

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