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arXiv 0810.3292cond-mat.supr-concond-mat.stat-mech
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铁基高温超导体涡旋-晶格熔化的弹性理论

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

Qing-Hu Chen, Qing-Miao Nie, Jian-Ping Lv

摘要:

本文用弹性理论研究了两种典型铁基高温超导体$Ba(Fe_{1-x}Co_{x})_{2}As_{2}$(122型)和$Nd(O_{1-x}F_{x})FeAs$(1111型)在平行和垂直于各向异性轴的磁场作用下的涡旋-晶格熔化转变。利用实验得到的参数,用各组林德曼数对H-T图上的涡格熔化线进行了系统的定位。观察到平行场作用下$Ba(Fe_{1-x}Co_{x})_{2}As_{2}$上涡旋熔化的理论结果与最近的实验结果符合得很好。通过调整合理的林德曼数,可以将未来的涡旋融化实验结果与目前的理论预测进行比较。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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