Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 20, Issue 7, Pages 687-690Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-2048/20/7/017
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High quality LaOFeP superconducting materials have been successfully synthesized by a two- step solid reaction method. We first prepared a La - Fe - P ternary alloy following a pre- alloying treatment; the resultant La - Fe - P ternary alloy was found to be the key precursor for producing the final LaOFeP superconductors in our experiments. The LaOFeP samples in general have a superconducting transition temperature of about T-c approximate to 4.1 K as demonstrated by the measurements of resistivity and magnetic susceptibility. The volume ratio of the superconducting phase in the high quality sample is estimated to be as high as 95% at the temperature of 2 K. Structural analysis by means of x- ray diffraction, electron diffraction and high resolution transmission electron microscopy shows that the LaOFeP crystal has a layered tetragonal structure with a P4/nmm space group. Structural defects such as stacking faults in the LaOFeP sample have also been briefly discussed.
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