Abstract
We discuss measurements of the ac complex conductance of a-MoGe films in the presence of a perpendicular magnetic field. The ac response of vortices in samples with weak pinning reveals an anomaly that is found to be consistent with a dislocation mediated melting in the two-dimensional vortex lattice on short length scales. However, increasing the effects of disorder on the vortex lattice by reducing the sample thickness leads to dominance of thermal-activated creep over melting. With increasing disorder, the length scale associated with the correlations in the vortex lattice is reduced and eventually the melting phenomenon disappears.
Original language | English (US) |
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Pages (from-to) | 16117-16120 |
Number of pages | 4 |
Journal | Physical Review B |
Volume | 50 |
Issue number | 21 |
DOIs | |
State | Published - 1994 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics