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  Identification of a possible superconducting transition above room temperature in natural graphite crystals

Precker, C. E., Esquinazi, P. D., Champi, A., Barzola-Quiquia, J., Zoraghi, M., Muiños-Landin, S., et al. (2016). Identification of a possible superconducting transition above room temperature in natural graphite crystals. New Journal of Physics, 18: 113041. doi:10.1088/1367-2630/18/11/113041.

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 Creators:
Precker, Christian E.1, Author
Esquinazi, Pablo D.1, Author
Champi, Ana 1, Author
Barzola-Quiquia, José 1, Author
Zoraghi, Mahsa1, Author              
Muiños-Landin, Santiago 1, Author
Setzer, Annette 1, Author
Böhlmann, Winfried1, Author
Spemann, Daniel 1, Author
Meijer, Jan 1, Author
Muenster, Tom 1, Author
Baehre, Oliver 1, Author
Kloess, Gert 1, Author
Beth, Henning 1, Author
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1External Organizations, ou_persistent22              

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 Abstract: Measuring with high precision the electrical resistance of highly ordered natural graphite samples from a Brazil mine, we have identified a transition at ~350 K with ~40 K transition width. The step-like change in temperature of the resistance, its magnetic irreversibility and time dependence after a field change, consistent with trapped flux and flux creep, and the partial magnetic flux expulsion obtained by magnetization measurements, suggest the existence of granular superconductivity below 350 K. The zero-field virgin state can only be reached again after zero field cooling the sample from above the transition. Paradoxically, the extraordinarily high transition temperature we found for this and several other graphite samples is the reason why this transition remained undetected so far. The existence of well ordered rhombohedral graphite phase in all measured samples has been proved by x-rays diffraction measurements, suggesting its interfaces with the Bernal phase as a possible origin for the high-temperature superconductivity, as theoretical studies predicted. The localization of the granular superconductivity at these two dimensional interfaces prevents the observation of a zero resistance state or of a full Meissner state.

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Language(s): eng - English
 Dates: 2016-07-132016-10-262016-11-23
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1088/1367-2630/18/11/113041
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Title: New Journal of Physics
  Abbreviation : New J. Phys.
Source Genre: Journal
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Publ. Info: Bristol : IOP Publishing
Pages: - Volume / Issue: 18 Sequence Number: 113041 Start / End Page: - Identifier: ISSN: 1367-2630
CoNE: https://pure.mpg.de/cone/journals/resource/954926913666