Giant superconducting proximity effect in graphite / Efeito de proximidade gigante entre supercondutor e grafite

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

In order to verify the existence of superconducting correlations in graphite, in this work we studied the possibility of the so-called giant proximity effect in highly oriented pyrolytic graphite (HOPG) samples. Magnetoresistance measurements performed on various thoroughly characterized HOPG samples with attached superconducting In or Pb-In electrodes revealed the occurrence of proximity effect on a scale much bigger than a coherence length of superconducting electrodes, indicating that graphite can be considered as a phase-fluctuating superconductor, indeed. Besides, our studies revealed a suppression of the proximity effect in magnetic field H ~ 1 kOe applied perpendicularly to graphene planes. Additionally, we performed comparative studies of the proximity effect in semimetallic bismuth. We discuss the obtained results in terms of available theoretical models

ASSUNTO(S)

transição de fase metal-isolante supercondutividade grafite efeito de proximidade bismuto junções josephson

ACESSO AO ARTIGO

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