Abstract
Anomalous c-axis isothermal magnetization results are reported for partial Pb-substituted (Formula presented) single crystals with overdoped superconducting transition (Formula presented) of 69 K and anisotropy parameter (Formula presented) Contrary to optimum-doped Bi-2212 crystals, both second magnetization peak (Formula presented) and onset field (Formula presented) exhibit strong and meaningful temperature dependence (150 G-2 kG for (Formula presented) and 160 G-5.2 kG for (Formula presented) in a much extended temperature range from 11 K up to 62 K (Formula presented) where they cross with the low-field irreversibility line (Formula presented) The theoretical fitting of the temperature variation indicates that (Formula presented) is related to the static-disorder induced transition from an ordered vortex quasilattice (or Bragg glass) to an entangled vortex glass state, and (Formula presented) seems to be related to the thermal-disorder induced vortex pancake decoupling transition. The (Formula presented) and (Formula presented) terminations at low and high temperature as well as relaxation are fully discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 11301-11304 |
| Number of pages | 4 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 61 |
| Issue number | 17 |
| DOIs | |
| Publication status | Published - 2000 |
| Externally published | Yes |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics