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首页> 外文期刊>Physica, C. Superconductivity and its applications >Coexistence of superconductivity and ferromagnetism in hybrid rutheno-cuprate superconductors RuSr2RCu2O8
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Coexistence of superconductivity and ferromagnetism in hybrid rutheno-cuprate superconductors RuSr2RCu2O8

机译：钌-铜混合超导体RuSr2RCu2O8中超导和铁磁性的共存

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摘要

I consider the extended two-band s-f model with additional terms, describing inter-site Cooper pairs interaction between two-subsystems s and f, respectively. Following Green's function technique and equation of motion method self-consistent equations for superconducting order parameter (Delta) and magnetic order parameter (m(f)) are derived. The expressions for specific heat, density of states, and free energy are also derived. The theory has been applied to explain the coexistence of superconductivity and ferromagnetism in hybrid rutheno-cuprate superconductors RuSr2RECu2O8 (RE = Gd, Eu). The theory shows that it is possible to become superconducting via a second order phase transition if the system is already ferromagnetic. The agreement between theory and experimental observations is quite satisfactory.
机译：我考虑了带有附加项的扩展两波段s-f模型，分别描述了两个子系统s和f之间的站点间库珀对交互。遵循格林函数技术和运动方程，推导了超导阶参数（Delta）和磁阶参数（m（f））的自洽方程。还导出了比热，状态密度和自由能的表达式。该理论已被用于解释在钌-铜混合超导体RuSr2RECu2O8（RE = Gd，Eu）中超导性和铁磁性的共存。该理论表明，如果系统已经是铁磁性的，则有可能通过二阶相变而变得超导。理论和实验观察之间的一致性是令人满意的。

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