Magneto-fluctuations of the normal resistance RN have been reproducibly observed in YBa2Cu3O7d biepitaxial grain boundary junctions at low temperatures. We attribute them to mesoscopic transport in narrow channels across the grain boundary line, occurring even in the presence of large voltage drops. The Thouless energy appears to be the relevant energy scale. Possible implications on the understanding of coherent transport of quasiparticles in high critical temperature superconductors (HTS) and of the dissipation mechanisms are discussed.
Coherent quasiparticle transport in grain boundary junctions employing high-Tc superconductors
TAFURI, Francesco;
2008
Abstract
Magneto-fluctuations of the normal resistance RN have been reproducibly observed in YBa2Cu3O7d biepitaxial grain boundary junctions at low temperatures. We attribute them to mesoscopic transport in narrow channels across the grain boundary line, occurring even in the presence of large voltage drops. The Thouless energy appears to be the relevant energy scale. Possible implications on the understanding of coherent transport of quasiparticles in high critical temperature superconductors (HTS) and of the dissipation mechanisms are discussed.File in questo prodotto:
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