High-Temperature Superconductivity in Sulfur-Doped Amorphous Carbon Systems

Felner, I.; Wolf, Omri; Millo, Oded

doi:10.1007/s10948-011-1327-x

Cited by 11 publications

(15 citation statements)

References 11 publications

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“…Since then, a considerable amount of studies reported this phenomenon in carbon-based systems, reaching critical temperatures T c ∼ 10 K in intercalated graphite [65,66] and above 30 K -though not percolative -in some HOPG samples [59] as well as in doped graphite and amorphous carbon systems [67][68][69][70]. Traces of superconductivity at T c = 65 K have been recently reported in amorphous carbon powder that contained a small amount of sulfur [71]. Superconductivity was found also in carbon nanotubes with T c = 0.55 K [72] and 12 K [73] or possibly even higher critical temperatures [74,75].…”

Section: Discussionmentioning

confidence: 99%

Invited review: Graphite and its hidden superconductivity

Esquinazi

2013

Pap. Phys.

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We review experimental results, from transport to magnetization measurements, on different graphite samples, from bulk oriented graphite, thin graphite films to transmission electron microscope lamellae, that indicate the existence of granular superconductivity at temperatures above 100 K. The accumulated evidence speaks for a localization of the superconducting phase(s) at certain interfaces embedded in semiconducting crystalline regions with Bernal stacking order.

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Section: Discussionmentioning

confidence: 99%

Invited review: Graphite and its hidden superconductivity

Esquinazi

2013

Pap. Phys.

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“…Here, we review unusual magnetic properties of three a-C materials obtained from different sources: (a) commercial and (b) synthetic a-C powders and (c) a-C thin films obtained by EBID. [3][4][5] All investigated materials appear to be inhomogeneous. That means that the magnetic features measured on different samples taken from the same batch or source may differ each from other.…”

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confidence: 99%

Superconductivity and unusual magnetic behavior in amorphous carbon

Felner

2014

Mater. Res. Express

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Traces of superconductivity (SC) at elevated temperatures (up to 65 K) were observed by magnetic measurements in three different inhomogeneous sulfur doped amorphous carbon (a-C) systems: (a) in commercial and (b) synthesized powders and (c) in a-C thin films. (a) Studies performed on commercial (a-C) powder which contains 0.21% of sulfur, revealed traces of non-percolated superconducting phases below T c = 65 K. The SC volume fraction is enhanced by the sulfur doping. (ii) Unexpectedly these peaks are totally suppressed in the second ZFC runs measured a few minutes later. (iii) Around the peak position the field-cooled (FC) curves cross the ZFC plots (ZFC>FC). These peculiar magnetic observations also ascribed to a-CS powder prepared from the commercial a-C powder and are connected to each other. All SC and magnetic phenomena observed are intrinsic properties of the sulfur doped a-C materials. It is proposed that the a-CS systems behave similarly to well known high T C curates and/or pnictides in which SC emerges from magnetic states.

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“…In the R(T )-curve for sample 6 a rather distinct change of slope occurs at about 5 K, clearly far above the actual onset of the superconducting transition at 3.8 K. We note, that the superconductor W x C y Ga z O δ typically shows the onset to superconductivity at 5 K 5, [14][15][16][17] . From this observation one may speculate that the slope change in sample 6 is an indication for the formation of a non-percolative and inhomogenous superconducting phase with a critical temperature of 5 K. The question then arises whether the specific properties of the refractory metal component, W or Mo, is really decisive for the formation of the superconducting state or if the substrate of the superconduting phase is rather the carbon component, as was recently speculated for W-based FEBID structures with sulphur doping 18,19 . This has to be adressed in future studies.…”

Section: Superconductivity In the Systemmentioning

confidence: 90%

Superconductivity in the system MoxCyGazOδ prepared by focused ion beam induced deposition

Weirich

Schwalb

Winhold

et al. 2014

Journal of Applied Physics

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We have prepared the new amorphous superconductor MoxCyGazOδ with a maximum critical temperature Tc of 3.8 K by the direct-write nano-patterning technique of focused (gallium) ion beam induced deposition (FIBID) using Mo(CO)6 as precursor gas. From a detailed analysis of the temperature-dependent resistivity and the upper critical field, we found clear evidence for proximity of the samples to a disorder-induced metal-insulator transition. We observed a strong dependence of Tc on the deposition parameters and identified clear correlations between Tc, the localization tendency visible in the resistance data and the sample composition. By an in-situ feedback-controlled optimization process in the FIB-induced growth, we were able to identify the beam parameters which lead to samples with the largest Tc-value and sharpest transition into the superconducting state.

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High-Temperature Superconductivity in Sulfur-Doped Amorphous Carbon Systems

Cited by 11 publications

References 11 publications

Invited review: Graphite and its hidden superconductivity

Invited review: Graphite and its hidden superconductivity

Superconductivity and unusual magnetic behavior in amorphous carbon

Superconductivity in the system MoxCyGazOδ prepared by focused ion beam induced deposition

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