Coherent quasiparticle transport in grain boundary junctions employing high-Tc superconductors

F. Tafuri (1) , A. Tagliacozzo (2) , D. Born (2) , D. Stornaiuolo (2) , E. Gambale (1) , D. Dalena (1) , P. Lucignano (2) , Benoit Jouault (3) , F. Lombardi (4) , A. Barone (1) , B.L. Altshuler (5)

1 Dip. Ingegneria dell'Informazione
2 Dip. Scienze Fisiche
3 GES - Groupe d'étude des semiconducteurs
4 Dept. Microelectronics and Nanoscience
5 Physics Dept.

Magneto-fluctuations of the normal resistance RN have been reproducibly observed in YBa2Cu3O7-d biepitaxial grain boundary junctions at low temperatures. We attribute them to mesoscopic transport in narrow channels across the grain boundary line, occurring in an unusual energy regime. The Thouless energy appears to be the relevant energy scale. Possible implications on the understanding of coherent transport of quasiparticles in HTS and of the dissipation mechanisms are discussed.

Mots clés: mesoscopic physics; nanodevices; high critical temperature superconductors

Domaines: Science des matériaux [cond-mat.mtrl-sci]

F. Tafuri, A. Tagliacozzo, D. Born, D. Stornaiuolo, E. Gambale, et al.. Coherent quasiparticle transport in grain boundary junctions employing high-Tc superconductors. ENS 2006, Dec 2006, Paris, France. pp.140-144. ⟨hal-00166779⟩