Intrinsic Properties of Stoichiometric LaOFeP

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.

Intrinsic Properties of Stoichiometric LaOFeP

Authors

Description

DC and ac magnetization, resistivity, specific heat, and neutron diffraction data reveal that stoichiometric LaOFeP is metallic and non-superconducting above T = 0.35 K, with gamma = 12.5 mJ/mol*K. Neutron diffraction data at room temperature and T = 10 K 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 uB/Fe. We propose a model, based on the shape of the iron-pnictide tetrahedron, that explains the differences between LaOFeP and LaOFeAs, the parent compound of the recently discovered high-Tc oxyarsenides, which, in contrast, shows both structural and spin density wave (SDW) transitions.
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