Physics – Condensed Matter – Superconductivity
Scientific paper
2008-05-08
Z. Naturforsch. B - Chem. Sci. 2008, 63, 1057-1061
Physics
Condensed Matter
Superconductivity
submitted to Z. Naturforsch. B
Scientific paper
A polycrystalline sample of superconducting LaFePO was prepared in a tin flux at 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 phase analysis was performed by the Rietveld method. LaFePO is Pauli-paramagnetic and becomes superconducting at 7 K after removing the ferromagnetic impurity phase Fe2P from the sample. 57Fe Moessbauer spectroscopy measurements at 298, 77, 4.2 and 4 K show single signals at isomer shifts around 0.35 mm/s, subject to weak quadrupole splitting. At 4 K, a symmetric line broadening appears, resulting from a small transferred magnetic hyperfine field of 1.15(1) T and accompanied by an angle of 54.7(5) between Bhf and Vzz, the main component of the electric field gradient tensor.
Johrendt Dirk
Pöttgen Rainer
Schellenberg Inga
Tegel Marcus
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