Superconducting Behavior of Interfaces in Graphite: Transport Measurements of Micro-constrictions

Details Superconducting Behavior of Interfaces in Graphite: Transport Measurements of Micro-constrictions Superconducting Behavior of Interfaces in Graphite: Transport Measurements of Micro-constrictions

2010-05-31

arxiv.org/abs/1005.5676v1

J Supercond Nov Magn (2011) 24: 401-405

Physics

Condensed Matter

Superconductivity

11 pages, 5 figures, ICSM2010 to be published in Journal of Superconductivity and Novel Magnetism

Scientific paper

We have studied the magnetoresistance (MR) of thin highly oriented pyrolytic graphite mesoscopic samples without and with micro-constrictions of different widths between the voltage electrodes. The MR for fields parallel to the c-axis shows an anomalous hysteresis loop compatible with the behavior expected for granular superconductors. The smaller the constriction width the larger is the anomalous hysteresis and the higher the temperature for its observation. Our results support the existence of granular superconductivity probably embedded at interfaces between crystalline graphite regions.

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