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Dynamic order-to-metastable-disorder vortex matter transition in Bi2Sr2CaCu2O8+delta
B Kalisky1, Y Myasoedov, A Shaulov
1Institute for Superconductivity, Department of Physics, Bar-Ilan University, Ramat-Gan, Israel. beena.kalisky@weizmann.ac.il
Physical Review Letters
|March 16, 2007
Summary
Magneto-optical studies reveal prism-shaped Bi2Sr2CaCu2O8+delta crystals exhibit greater metastability in transient vortex states compared to platelets. This suggests a dynamic phase transition due to distributed surface barriers.
Area of Science:
- Condensed Matter Physics
- Superconductivity Research
Background:
- Understanding transient vortex states is crucial for high-temperature superconductors like Bi2Sr2CaCu2O8+delta.
- Metastability effects influence the critical current and overall performance of superconducting materials.
Purpose of the Study:
- To investigate the impact of crystal shape on transient vortex states and metastability in Bi2Sr2CaCu2O8+delta.
- To compare the dynamics of vortex states in prism-shaped versus platelet crystals.
Main Methods:
- Magneto-optical measurements were employed to probe transient vortex states.
- Crystals of Bi2Sr2CaCu2O8+delta in both prism and platelet shapes were analyzed.
Main Results:
- Prism-shaped crystals demonstrated enhanced metastability effects compared to platelet crystals.
- A significant shift in the second magnetization peak and distinct dynamics were observed in prism samples.
- Dislocations are proposed to be generated dynamically throughout prism samples due to surface barriers, unlike edge-only generation in platelets.
Conclusions:
- Crystal shape significantly influences vortex state metastability and dynamics in Bi2Sr2CaCu2O8+delta.
- Distributed surface barriers in prism samples may induce a dynamic phase transition to a disordered phase below the thermodynamic transition field.
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