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Evidence for diverging barriers in the disordered vortex solid in the (K,Ba)BiO(3) superconducting oxide
1Laboratoire d'Etudes des Propriétés Electroniques des Solides, Centre National de la Recherche Scientifique, BP 166, 38042 Grenoble Cedex 9, France.
Physical Review Letters
|November 3, 2001
Summary
Investigating vortex dynamics in (K,Ba)BiO3 superconductors reveals power law diverging barriers near the order-disorder transition. The observed mu exponent aligns with collective creep theories, particularly plastic collective creep.
Area of Science:
- Condensed Matter Physics
- Superconductivity Research
Background:
- Vortex dynamics are crucial for understanding superconductor properties.
- The behavior of vortices near phase transitions is complex and requires detailed study.
Purpose of the Study:
- To investigate vortex dynamics in cubic (K,Ba)BiO3 superconductor.
- To analyze the influence of temperature and magnetic field on vortex behavior.
Main Methods:
- Utilized ac susceptibility measurements across a wide frequency range (0.03 Hz to 60 kHz).
- Analyzed the frequency dependence of vortex barriers.
Main Results:
- Identified power law diverging barriers on both sides of the order-disorder transition line.
- Observed the mu exponent near 5/2 (elastic creep value) in the disordered phase.
- Found that the mu exponent decreases at higher temperatures and/or fields, supporting collective creep theories.
Conclusions:
- The findings support recent theories on plastic collective creep in superconductors.
- Vortex dynamics in (K,Ba)BiO3 exhibit behavior consistent with theoretical predictions for collective creep.