Synthesis, crystal structure, microstructure, transport and magnetic properties of SmFeAsO and SmFeAs(O0.93F0.07) (Articolo in rivista)

Type
Label
  • Synthesis, crystal structure, microstructure, transport and magnetic properties of SmFeAsO and SmFeAs(O0.93F0.07) (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • Martinelli A.; Ferretti M.; Manfrinetti P.; Palenzona A.; Tropeano M.; Cimberle M. R.; Ferdeghini C.; Valle R.; Bernini C.; Putti M.; Siri A. (2008)
    Synthesis, crystal structure, microstructure, transport and magnetic properties of SmFeAsO and SmFeAs(O0.93F0.07)
    in Superconductor science and technology (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Martinelli A.; Ferretti M.; Manfrinetti P.; Palenzona A.; Tropeano M.; Cimberle M. R.; Ferdeghini C.; Valle R.; Bernini C.; Putti M.; Siri A. (literal)
Pagina inizio
  • 095017 (literal)
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  • 21 (literal)
Rivista
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  • In: Superconductor Science & Technology, vol. 21 (9) article n. 095017. IOP Publishing Ltd, 2008. (literal)
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  • 7 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • CNR-INFM, Genova, DCCI Università di Genova e CNR-INFM-LAMIA, CNR-INFM-LAMIA e Dipartimento di Fisica Genova, CNR-IMEM, Genova, Dipartimento di Fisica Genova e CNR-INFM-LAMIA (literal)
Titolo
  • Synthesis, crystal structure, microstructure, transport and magnetic properties of SmFeAsO and SmFeAs(O0.93F0.07) (literal)
Abstract
  • SmFeAsO and the isostructural superconducting SmFeAs(O0.93F0.07) phase were prepared and characterized by means of Rietveld refinement of x-ray powder diffraction data, scanning electron microscope observation, transmission electron microscope analysis, and resistivity and magnetization measurements. 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, thus affecting the sample purity. 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 T similar to 140 K and the latter due to the Sm ions that order antiferromagnetically at low temperature. The feature at 140 K disappears in the F-substituted sample, and a superconducting transition appears, at low temperatures. The magnetoresistivity curves of the F-substituted sample probably indicate very high critical field values. (literal)
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