Effect of 3d transition metal doping on the superconductivity in quaternary fluoroarsenide CaFeAsF

Satoru Matsuishi, Yasunori Inoue, Takatoshi Nomura, Yoichi Kamihara, Masahiro Hirano, Hideo Hosono

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Abstract

We examined the doping effect of 3d transition metal (TM) elements (Cr, Mn, Co, Ni and Cu) at the Fe site of a quaternary fluoroarsenide CaFeAsF, an analogue of 1111-type parent compound LaFeAsO. The anomaly at ∼120 K observed in resistivity (ρ) versus temperature (T) plot for the parent compound is suppressed by the doping of each TM element. Furthermore, Co and Ni doping (CaFe1-xTMxAsF, TM = Co, Ni) induces superconductivity with a transition temperature maximized at the nominal x = 0.10 for Co (22K) and at x = 0.05 for Ni (12K). These optimal doping levels may be understood by considering that Ni2+(3d8) adds double electrons to the FeAs layers compared with Co2+ (3d7). Increased x for Co or Ni breaks the superconductivity, while metallic nature dρ/dT > 0 is still kept. These observations indicate that Co and Ni serve as electron donors. In contrast, Cr, Mn and Cu doping does not induce superconductivity, yielding dρ/dT < 0 below the ρ-T anomaly temperature, indicating that these TM ions act as scattering centers. The two different types of behavior of TM replacing the Fe site are discussed in relation to the changes in the lattice constants with doping.

Original languageEnglish
Article number025012
JournalNew Journal of Physics
Volume11
DOIs
Publication statusPublished - 2009 Feb 27
Externally publishedYes

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superconductivity
transition metals
anomalies
metal ions
electrons
plots
transition temperature
analogs
electrical resistivity
temperature
scattering

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Effect of 3d transition metal doping on the superconductivity in quaternary fluoroarsenide CaFeAsF. / Matsuishi, Satoru; Inoue, Yasunori; Nomura, Takatoshi; Kamihara, Yoichi; Hirano, Masahiro; Hosono, Hideo.

In: New Journal of Physics, Vol. 11, 025012, 27.02.2009.

Research output: Contribution to journalArticle

Matsuishi, Satoru ; Inoue, Yasunori ; Nomura, Takatoshi ; Kamihara, Yoichi ; Hirano, Masahiro ; Hosono, Hideo. / Effect of 3d transition metal doping on the superconductivity in quaternary fluoroarsenide CaFeAsF. In: New Journal of Physics. 2009 ; Vol. 11.
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