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arXiv 1006.3471cond-mat.supr-concond-mat.str-el
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Co取代EuFe2As2的局域磁矩铁磁性与超导电性的竞争

Competition of local-moment ferromagnetism and superconductivity in Co-substituted EuFe2As2

M. Nicklas, M. Kumar, E. Lengyel, W. Schnelle, A. Leithe-Jasper

摘要:

与SrFe 2 As 2相比,其中只有铁具有磁矩,在EuFe 2 As 2中,Eu 2+携带额外的大的局部磁矩。与SrFe_2As_2一样,EuFe_2As_2在高温下也表现出自旋密度波转变,但在20 K附近还表现出Eu ~(2+)量级的磁矩。压力诱导的超导性和Eu 2+秩序的相互作用导致的行为,这是让人想起的再入超导性,因为它是观察到的,例如,在三元Chevrel相或在稀土镍硼碳化物。在这里,我们研究了微妙的相互作用的有序的Eu 2+的时刻和超导电性在EuFe 1.9Co 0.1As 2,其中的应用程序的外部压力使得有可能灵敏地调整的比率的磁性(T_C)和超导(T_{c,onset})临界温度。发现当T_C > T_{c,onset}时,超导电性消失。

英文摘要:

In contrast to SrFe2As2, where only the iron possesses a magnetic moment, in EuFe2As2 an additional large, local magnetic moment is carried by Eu2+. Like SrFe2As2, EuFe2As2 exhibits a spin-density wave transition at high temperatures, but in addition the magnetic moments of the Eu2+ order at around 20 K. The interplay of pressure-induced superconductivity and the Eu2+ order leads to a behavior which is reminiscent of re-entrant superconductivity as it was observed, for example, in the ternary Chevrel phases or in the rare-earth nickel borocarbides. Here, we study the delicate interplay of the ordering of the Eu2+ moments and superconductivity in EuFe1.9Co0.1As2, where application of external pressure makes it possible to sensitively tune the ratio of the magnetic (T_C) and the superconducting (T_{c,onset}) critical temperatures. We find that superconductivity disappears once T_C > T_{c,onset}.

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