Elastic theory for the vortex-lattice melting in iron-based high-Tc superconductors

Details Elastic theory for the vortex-lattice melting in iron-based high-Tc superconductors Elastic theory for the vortex-lattice melting in iron-based high-Tc superconductors

2008-10-18

arxiv.org/abs/0810.3292v2

New Journal of Physics 11, 035003(2009)

Physics

Condensed Matter

Superconductivity

10 pages, 5 figures

Scientific paper

10.1088/1367-2630/11/3/035003

The vortex-lattice melting transitions in two typical iron-based high-Tc superconductor $Ba(Fe_{1-x}Co_{x})_{2}As_{2}$ (122-type) and$Nd(O_{1-x}F_{x})FeAs$ (1111-type) for magnetic fields both parallel and perpendicular to the anisotropy axis are studied within the elastic theory. Using the parameters from experiments, the vortex-lattice melting lines in the H-T diagram are located systematically by various groups of Lindemann numbers. It is observed that the theoretical result for the vortex melting on $Ba(Fe_{1-x}Co_{x})_{2}As_{2}$ for parallel fields agrees well the recent experimental data. The future experimental results for the vortex melting can be compared with the present theoretical prediction by tuning reasonable Lindemann numbers.

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