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

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) Å , Z = 2), and the phase analysis was performed by the Rietveld method. LaFePO is Pauli-paramagnetic an...

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Published inZeitschrift für Naturforschung. B, A journal of chemical sciences Vol. 63; no. 9; pp. 1057 - 1061
Main Authors Tegel, Marcus, Schellenberg, Inga, Pöttgen, Rainer, Johrendt, Dirk
Format Journal Article
LanguageEnglish
Published Verlag der Zeitschrift für Naturforschung 01.09.2008
Subjects
electric field
Iron
isomers
magnetism
Mössbauer Spectroscopy
Pnictide Oxide
spectroscopy
Superconductivity
tin
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Summary: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) Å , 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 Fe P from the sample. Fe Mössbauer 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 B and V , the main component of the electric field gradient tensor.
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ISSN:0932-0776
1865-7117
1865-7117
DOI:10.1515/znb-2008-0907