Intrinsic properties of stoichiometric LaFePO

T. M. McQueen, M. Regulacio, A. J. Williams, Q. Huang, J. W. Lynn, Y. S. Hor, D. V. West, M. A. Green, R. J. Cava

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Abstract

DC and ac magnetization, resistivity, specific-heat, and neutron-diffraction data reveal that stoichiometric LaFePO is metallic and non-superconducting above T=0.35K, with γ=12.5 mJ mol K2. Neutron-diffraction data at room temperature and T=10K are well described by the stoichiometric, tetragonal ZrCuSiAs structure, and show no signs of structural distortions or long-range magnetic ordering to an estimated detectability limit of 0.07 μB /Fe. We propose a model based on the shape of the iron-pnictide tetrahedron that explains the differences between LaFePO and LaFeAsO, the parent compound of the recently discovered high-Tc oxyarsenides, which, in contrast, shows both structural and spin-density wave transitions.

Original languageEnglish (US)
Article number024521
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number2
DOIs
StatePublished - Jul 29 2008

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    McQueen, T. M., Regulacio, M., Williams, A. J., Huang, Q., Lynn, J. W., Hor, Y. S., West, D. V., Green, M. A., & Cava, R. J. (2008). Intrinsic properties of stoichiometric LaFePO. Physical Review B - Condensed Matter and Materials Physics, 78(2), [024521]. https://doi.org/10.1103/PhysRevB.78.024521