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Dynamic coupling-decoupling crossover in the current-driven vortex state in Tl2Ba2CaCu2O8 probed by the Josephson
V K Thorsmølle1, R D Averitt, T Shibauchi
1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Physical Review Letters
|February 7, 2007
Summary
We studied vortex ordering in a superconductor using terahertz spectroscopy. Increasing current in the vortex solid phase decreases order, while in the vortex liquid phase, order increases above a threshold.
Area of Science:
- Condensed matter physics
- Superconductivity research
- Terahertz spectroscopy applications
Background:
- Josephson plasma resonance in superconductors provides insight into vortex dynamics.
- Understanding vortex ordering is crucial for high-temperature superconductors.
Purpose of the Study:
- To investigate the longitudinal ordering of pancake vortices in Tl2Ba2CaCu2O8+delta.
- To analyze the effect of applied ab-plane current on vortex ordering under a c-axis magnetic field.
Main Methods:
- Utilized terahertz spectroscopy to measure Josephson plasma resonance.
- Applied varying ab-plane currents in a 2.5 kG c-axis magnetic field.
Main Results:
- Observed decreased interlayer phase coherence in the low-temperature vortex solid phase with increasing current, indicating pancake vortex misalignment.
- Noted increased longitudinal ordering in the high-temperature vortex liquid phase above a specific current threshold.
Conclusions:
- The study provides evidence for a current-driven coupling-decoupling crossover in the pinned liquid phase.
- Results highlight the complex interplay between current, temperature, and vortex behavior in layered superconductors.
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