Unusual magnetic properties and superconductivity in sulfur-doped amorphous carbon powder

I. Felner*, E. Prilutskiy

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

An amorphous carbon (a-C) powder obtained by decomposition of sucrose was mixed with sulfur and synthesized at 400 °C. Magnetic measurements reveal that the products obtained are inhomogeneous. Some parts show traces of superconductivity at TC = 17 and 42 K. Other parts show unusual magnetic features. (i) Pronounced irreversible peaks around 50 K appear in the first zero-fieldcooled (ZFC) sweep only. (ii) Unexpectedly, these peaks are totally suppressed in the second ZFC runs performed a few minutes later. Around the peak position, the field-cooled (FC) curves cross the ZFC plots, such that ZFC > FC. The two peculiar magnetic observations are connected to each other and are also ascribed to the a-C powder taken from commercial sources. The possibility that impurities cause these magnetic phenomena is excluded.

Original languageEnglish
Pages (from-to)2547-2555
Number of pages9
JournalJournal of Superconductivity and Novel Magnetism
Volume25
Issue number8
DOIs
StatePublished - Dec 2012

Keywords

  • Amorphous carbon
  • Magnetism
  • Superconductivity

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