Intrinsic Properties of Stoichiometric LaFePo
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.
T. M. McQueen et al., "Intrinsic Properties of Stoichiometric LaFePo," Physical Review B - Condensed Matter and Materials Physics, vol. 78, no. 2, American Physical Society (APS), Jul 2008.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevB.78.024521
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