Unusual Magnetic Properties and Superconductivity in Sulfur-Doped Amorphous Carbon Powder |
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| Authors: | I Felner E Prilutskiy |
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| Affiliation: | 1. Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel
2. Institute for Problems of Material Science, National Academy of Sciences of Ukraine, Krzhizhanovski, Str. 3, Kiev, 03142, Ukraine
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| 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 T C=17?and 42?K. Other parts show unusual magnetic features. (i)?Pronounced irreversible peaks around 50?K appear in the first zero-field-cooled (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. |
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