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arXiv 0709.2495cond-mat.supr-con
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基于PdFe合金的超导-铁磁-超导结临界电流的再入温度依赖性

Reentrant temperature dependence of critical current in superconductor - ferromagnet - superconductor junctions based on PdFe alloys

V. V. Bol'ginov, O. M. Vyaselev, V. N. Shilov

摘要:

研究了$Pd_{0.99}Fe_{0.01}$薄膜的磁性和输运性质。我们发现薄膜的居里温度约为20 K,在低于$T_{Curie}$的温度下,磁性强烈依赖于温度。我们还制作了超导-铁磁-超导约瑟夫森结$Nb-PdFe-Nb$。铁磁层厚度约为36 nm的结的温度依赖性示出了折返行为,这是结转变为$π$状态的证据。

英文摘要:

The magnetic and transport properties of $Pd_{0.99}Fe_{0.01}$ thin films have been studied. We have found that the Curie temperature of the films is about 20 K and the magnetic properties strongly depend on temperature below $T_{Curie}$. We have also fabricated the set of superconductor-ferromagnet-superconductor josephson junctions $Nb-PdFe-Nb$. The temperature dependence of the junctions with the ferromagnet layer thickness of about 36 nm shows the reentrant behaviour that is the evidence of the transition of the junction into the $π$-state.

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