Physics – Condensed Matter – Superconductivity
Scientific paper
2000-07-13
Solid State Commun, 115, 427-432 (2000)
Physics
Condensed Matter
Superconductivity
6 pages, 6 figures
Scientific paper
10.1016/S0038-1098(00)00212-X
In this communication we report studies of d.c current-voltage (I-V) characteristics of ultra thin films of Bi, quench condensed on single crystal sapphire substrates at T = 15K. The hysteretic I-V characteristics are explained using a resistively and capacitively shunted junction (RCSJ) model of Josephson junction arrays. The Josephson coupling energy($E_J$) and the charging energy($E_c$) are calculated for different thickness($d$) values. A low resistance state is found in the low current regime below the critical current, $I_c$. This resistance $R_0$ is found to have a minimum at a particular thickness ($d_c$) value. Reflection High Energy Electron Diffraction (RHEED) studies are done on these films. A distinct appearance of a diffuse ring near $d_c$ is observed in the diffraction images, consistent with the recent STM studies(Ekinci and Valles, PRL {\bf 82}(1999) 1518). These films show an irreversible annealing when temperature is increased. The annealing temperature ($T_a$) also has a maximum at the same thickness. Althoguh the R$_s$ vs T of quench condensed Bi films suggest that the films are uniform, our results indicate that even in thick films, the order parameter is not fully developed over the complete area of the film. These results are discussed qualitatively.
Chandrasekhar N.
Dasgupta Keshav
Moorthy V. H. S.
Sambandamurthy G.
No associations
LandOfFree
Josephson junction array type I-V characteristics of quench-condensed ultra thin films of Bi does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Josephson junction array type I-V characteristics of quench-condensed ultra thin films of Bi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Josephson junction array type I-V characteristics of quench-condensed ultra thin films of Bi will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-415453