Weak ferromagnetism of Cux Fe1+yAs and its evolution with Co doping

Bin Qian, Jin Hu, Jinyu Liu, Zhida Han, Ping Zhang, Lei Guo, Xuefan Jiang, T. Zou, M. Zhu, C. R. Dela Cruz, X. Ke, Z. Q. Mao

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Abstract

We have investigated electronic and magnetic properties of iron pnictide CuxFe1+yAs, which is isostructural to iron pnictide superconductors LiFeAs and NaFeAs, using polycrystalline and single-crystal samples. We found that CuxFe1+yAs is characterized by strong electron correlations and shows weak ferromagnetic behavior with the Curie temperature Tc∼42K, in contrast with the superconductivity in LiFeAs and NaFeAs. Its electronic transport properties exhibit quasi-two-dimensional characteristics: While the in-plane resistivity follows quadratic temperature dependence for T<10K, the c-axis resistivity shows nonmetal-to-metal crossover near 20 K. In addition, we have studied the Co-doping effect on CuxFe1+yAs and found that Co doping enhances the ferromagnetism with Tc increasing up to 83 K for CuxFe0.5Co0.5As. From these results, we discussed the origin of the ferromagnetism of CuxFe1+yAs and its relevance with the magnetism of iron pnictide superconductor parent compounds.

Original languageEnglish (US)
Article number014504
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number1
DOIs
StatePublished - Jan 12 2015

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Qian, B., Hu, J., Liu, J., Han, Z., Zhang, P., Guo, L., Jiang, X., Zou, T., Zhu, M., Dela Cruz, C. R., Ke, X., & Mao, Z. Q. (2015). Weak ferromagnetism of Cux Fe1+yAs and its evolution with Co doping. Physical Review B - Condensed Matter and Materials Physics, 91(1), [014504]. https://doi.org/10.1103/PhysRevB.91.014504