Intrinsic properties of stoichiometric LaFePO

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T. M. McQueen,¹ M. Regulacio,¹ A. J. Williams,¹ Q. Huang,² J. W. Lynn,² Y. S. Hor,¹ D. V. West,¹ M. A. Green,^2,3 and R. J. Cava¹
¹Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
²NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
³Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-2115, USA

Received 14 May 2008; published 29 July 2008

DCand ac magnetization, resistivity, specific-heat, and neutron-diffraction data reveal thatstoichiometric LaFePO is metallic and non-superconducting above T=0.35 K, with gamma =12.5 ((mJ)/(mol K[sup 2])) .Neutron-diffraction data at room temperature and T=10 K are well describedby the stoichiometric, tetragonal ZrCuSiAs structure, and show no signsof structural distortions or long-range magnetic ordering to an estimateddetectability limit of 0.07µ_B/Fe. We propose a model based onthe shape of the iron-pnictide tetrahedron that explains the differencesbetween LaFePO and LaFeAsO, the parent compound of the recentlydiscovered high-Tc oxyarsenides, which, in contrast, shows both structural andspin-density wave transitions.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.78.024521
DOI:	10.1103/PhysRevB.78.024521
PACS:	74.70.Dd; 74.25.Bt; 61.05.fm 74.70.Dd Superconducting ternary, quaternary and multinary compounds 74.25.Bt Thermodynamic properties of superconductors 61.05.fm Neutron diffraction (condensed matter structure determination) YEAR: 2008
KEYWORDS:	electrical resistivity, high-temperature superconductors, iron compounds, lanthanum compounds, magnetisation, neutron diffraction, specific heat, spin density waves, stoichiometry

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