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A polycrystalline sample of superconducting LaFePO was prepared in a tin fluxat 1123 K. The structure was determined from single crystal data(ZrCuSiAs-type, P4/nmm, a = 3.9610(1), c = 8.5158(2) A, Z = 2) and the phaseanalysis was performed by the Rietveld method. LaFePO is Pauli-paramagnetic andbecomes superconducting at 7 K after removing the ferromagnetic impurity phaseFe2P from the sample. 57Fe Moessbauer spectroscopy measurements at 298, 77, 4.2and 4 K show single signals at isomer shifts around 0.35 mm/s, subject to weakquadrupole splitting. At 4 K, a symmetric line broadening appears, resultingfrom a small transferred magnetic hyperfine field of 1.15(1) T and accompaniedby an angle of 54.7(5) between Bhf and Vzz, the main component of the electricfield gradient tensor.

A 57Fe Moessbauer Spectroscopy Study of the 7 K Superconductor LaFePO