Superconductivity induced by doping platinum in BaFe2 As 2

Xiyu Zhu, Fei Han, Gang Mu, Peng Cheng, Jun Tang, Jing Ju, Katsumi Tanigaki, Hai Hu Wen

研究成果: Article査読

28 被引用数 (Scopus)

抄録

By substituting Fe with the 5d -transition metal Pt in BaFe2 As2, we have successfully synthesized the superconductors BaFe 2-x Ptx As2. The systematic evolution of the lattice constants indicates that the Fe ions were successfully replaced by Pt ions. By increasing the doping content of Pt, the antiferromagnetic order and structural transition of the parent phase is suppressed and superconductivity emerges at a doping level of about x=0.02. At a doping level of x=0.1, we get a maximum transition temperature Tc of about 25 K. While even for this optimally doped sample, the residual resistivity ratio is only about 1.35, indicating a strong impurity scattering effect. We thus argue that the doping to the Fe sites naturally leads to a high level impurity scattering, although the superconductivity can still survive at about 25 K. The synchrotron powder x-ray diffraction shows that the resistivity anomaly is in good agreement with the structural transition. The superconducting transitions at different magnetic fields were also measured at the doping level of about x=0.1, yielding a slope of -d Hc2/dT=5.4 T/K near Tc. Finally a phase diagram was established for the Pt-doped 122 system. Our results suggest that superconductivity can also be easily induced in the FeAs family by substituting the Fe with Pt with almost the similar maximum transition temperatures as doping Ni, Co, Rh, and Ir.

本文言語English
論文番号104525
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
81
10
DOI
出版ステータスPublished - 2010 3月 25
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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