Electromagnetic properties of undoped LaFePnO (Pn P, As)

Y. Kamihara, T. Watanabe, T. Nomura, S. W. Kim, T. Kamiya, M. Hirano, H. Hosono

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Undoped LaFePnO (Pn P, As) shows metallic resistivity and a tetragonal phase at room temperature. The electrical resistivity (ρ) of undoped LaFeAsO exhibits a sudden decrease around Tanom ∼160 K with decreasing the temperature and increases with decreasing the temperatures (T) below another threshold temperature (Tmin). It makes a contrast to undoped LaFePO, which shows neither of Tanom nor Tmin. The T anom corresponds to a crystallographic phase transition: undoped LaFeAsO shows an orthorhombic phase at temperatures < 160 K. A positive magnetoresistance (MR (ρ-ρ0) / ρ0) also appears below T anom. DFT calculations indicate that spin moment of LaFeAsO is 1.56 μB / Fe in an antiferromagnetic spin configuration in a tetragonal phase, while spin moment of LaFePO is almost quenched.

Original languageEnglish
Article number052090
JournalJournal of Physics: Conference Series
Issue number5
Publication statusPublished - 2009 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Kamihara, Y., Watanabe, T., Nomura, T., Kim, S. W., Kamiya, T., Hirano, M., & Hosono, H. (2009). Electromagnetic properties of undoped LaFePnO (Pn P, As). Journal of Physics: Conference Series, 150(5), [052090]. https://doi.org/10.1088/1742-6596/150/5/052090