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arXiv 0903.4668cond-mat.supr-con
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砷化铁中钌取代引起的超导电性:SrFe2-xRuxAs2(0 <= x <= 2)的研究

Superconductivity induced by ruthenium substitution in an iron arsenide: investigation of SrFe2-xRuxAs2 (0 <= x <= 2)

W. Schnelle, A. Leithe-Jasper, R. Gumeniuk, U. Burkhardt, D. Kasinathan, H. Rosner

摘要:

SrFe_2As_2的磁性可以通过Co或Ni少量取代Fe的电子掺杂来抑制,从而产生超导电性。我们证明,大量的替代Fe的等价钌同样抑制磁有序SrFe 2-xRuxAs 2,并导致体超导0.6 <= x <= 0.8。磁化强度、电阻率和比热数据显示Tc高达约20 K。详细的结构研究表明,随着x的增加,晶格参数比c/a强烈下降。DFT能带结构计算与SrFe 2-xRuxAs 2中的磁序仅在大x时不稳定的观察一致。

英文摘要:

The magnetism in SrFe2As2 can be suppressed by electron doping through a small substitution of Fe by Co or Ni, giving way to superconductivity. We demonstrate that a massive substitution of Fe by isovalent ruthenium similarly suppresses the magnetic ordering in SrFe2-xRuxAs2 and leads to bulk superconductivity for 0.6 <= x <= 0.8. Magnetization, electrical resistivity, and specific heat data show Tc up to approx 20K. Detailed structural investigations reveal a strong decrease of the lattice parameter ratio c/a with increasing x. DFT band structure calculations are in line with the observation that the magnetic order in SrFe2-xRuxAs2 is only destabilized for large x.

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