Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
1999-11-26
Physics
Condensed Matter
Disordered Systems and Neural Networks
latex, 11 files, 16 pages, submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.61.8108
Variable range hopping transport has been investigated in amorphous YSi from 30 mK to 2 K as a function of the temperature T and electric field F. For F=0, where conduction is along sinuous paths (isotropic percolation), the conductance G depends on T according to an Efros-Shklovskii law. The nonlinear I-V's were studied up to very high fields for which G no longer depends on T (directed percolation : current paths along F). We show that heating effects are negligible. Then, we show that for low F values, ln(G(F,T))=ln(G(0,T))-eFL/kT. The order of magnitude (5-10 nm) and the T dependence of L agree with theoretical predictions. From L, we extract the dielectric constant. The very high electric field data do not agree with the theoretical predictions, which could be due to tunneling across the mobility edge. For intermediate electric fields our data evidence the influence of the straightening of the paths (transition from isotropic to directed percolation). The statistical properties of the segments of the paths where the current flows against the electrical force are extracted for the first time.
L'Hôte Denis
Ladieu Francois
Tourbot R.
No associations
LandOfFree
Non-ohmic hopping transport in a-YSi: from isotropic to directed percolation 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 Non-ohmic hopping transport in a-YSi: from isotropic to directed percolation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-ohmic hopping transport in a-YSi: from isotropic to directed percolation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-618391