Physics – Condensed Matter – Superconductivity
Scientific paper
2008-06-13
Superconductor Science and Technology 21 (2008) 095017
Physics
Condensed Matter
Superconductivity
Submitted to: Superconductor Science and Technology
Scientific paper
10.1088/0953-2048/21/9/095017
SmFeAsO and the isostructural superconducting SmFeAs(O0.93F0.07) samples were prepared. Characterization by means of Rietveld refinement of X-ray powder diffraction data, scanning electron microscope observation, transmission electron microscope analysis, resistivity and magnetization measurements were carried out. Sintering treatment strongly improves the grain connectivity, but, on the other hand, induces a competition between the thermodynamic stability of the oxy-pnictide and Sm2O3, hence worsening the purity of the sample. In the pristine sample both magnetization and resistivity measurements clearly indicate that two different sources of magnetism are present: the former related to Fe ordering at 140 K and the latter due to the Sm ions that orders antiferromagnetically at low temperature. The feature at 140 K disappears in the F-substituted sample and, at low temperatures a superconducting transition appears. The magnetoresistivity curves of the F-substituted sample probably indicates very high critical field values.
Cimberle M. R.
Ferdeghini Carlo
Ferretti Marco
Manfrinetti P.
Martinelli Agostino
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