NDLI: Superconductivity and Unusual Magnetic Features in Amorphous Carbon and in Other Unrelated Materials

Content Provider	Springer Nature Link
Author	Felner, Israel
Copyright Year	2016
Abstract	Traces of superconductivity (SC) were observed in three different inhomogeneous sulfur-doped amorphous carbon (a-C) systems: (i) in old commercial powder, (ii) in fabricated (by pyrolytic decomposition of sucrose) powder, and (iii) in a-C thin films. (i) The commercial a-C powder contains 0.21 at% sulfur and reveals traces of two superconducting phases around T $_{C}$ ˜34 and T $_{C}$∼65 K. (ii) The fabricated a-C powder is diamagnetic but not superconducting. However, mixtures of this powder with sulfur (a-CS) which were heated to 250 °C also show traces of SC up to T $_{C}$∼42 K. (iii) Non-superconducting a-C thin films were grown by electron-beam induced deposition. SC at T $_{C}$∼34 K emerged only after heat treatment with sulfur. It is proposed that the high SC states in a-CS (T $_{C}$∼65 K at ambient pressure) and in H$_{3}$S materials (T $_{C}$ = 203 K under >200 GPa) has the same origin. In both sulfur-containing systems, SC is induced by the interaction between electrons and the high frequencies of low mass atom (H or C) vibrations a-CS products obtained by heating commercial and fabricated a-C powders at 400 °C show unusual magnetic features: (a) pronounced irreversible peaks around 55–80 K which appear in the first zero-field-cooled (ZFC) runs only. This temperature range is close to the highest T $_{C}$ observed. (b) These peaks are totally suppressed in the second ZFC sweeps measured a few minutes later. (c) The peaks reappear after 18 months. (d) Around the peak position, the field-cooled (FC) curves cross the ZFC plots (ZFC > FC). All these phenomena are intrinsic properties of the amorphous carbon materials and were not observed in crystalline graphite. The ZFC > FC state was also observed in chiral-based magnetic memory device and unexpectedly in the liver taken from a patient with mantle cell lymphoma. This peculiarity will be discussed.
Starting Page	55
Ending Page	61
Page Count	7
File Format	PDF
ISSN	15571939
Journal	Journal of Superconductivity and Novel Magnetism
Volume Number	30
Issue Number	1
e-ISSN	15571947
Language	English
Publisher	Springer US
Publisher Date	2016-09-02
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Amorphous carbon Superconductivity Peculiar magnetic behavior Strongly Correlated Systems, Superconductivity Magnetism, Magnetic Materials Condensed Matter Physics Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Condensed Matter Physics

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