Superconductivity in ferromagneticRuSr2GdCu2O8
Superconductivity in ferromagneticRuSr2GdCu2O8
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DOI：
10.1103/physrevb.62.11369
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发表时间：
2000-01
影响因子：
3.7
通讯作者：
Jian-Xin Zhu;C. Ting;C. Chu
中科院分区：
文献类型：
--
作者：
Jian-Xin Zhu;C. Ting;C. Chu
在BCS模型下，得到了RuSr_2GdCu_2O_8中CuO_2层与RuO_2层耦合的d波超导性的温度-交换场相图。发现Fulde-Ferrell-Larkin-Ovchinnikov态对能带填充因子非常敏感。对于强交换场，我们指出超导电性只能存在于铁磁畴间的界面。计算了磁化曲线，并与实验结果进行了比较。我们还提出了测量单个幺正杂质附近的隧穿电导来检测交换相互作用的强度。
The phase diagram of temperature versus exchange field is obtained within a BCS model for d-wave superconductivity in CuO_2 layers which is coupled to ferromagnetic RuO_2 layers in RuSr_2GdCu_2O_8. It is found that the Fulde-Ferrell-Larkin-Ovchinnikov state is very sensitive to the band filling factor. For strong exchange field, we point out that superconductivity could only exist in the interfaces between ferromagnetic domains. The magnetization curve is calculated and its comparison with experiment is discussed. We also propose the measuring of tunneling conductance near a single unitary impurity to detect the strength of the exchange interaction.