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Phase textures induced by dc-current pair breaking in weakly coupled multilayer structures and two-gap
1National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA.
Physical Review Letters
|October 10, 2006
Summary
We predict current-induced phase textures in multicomponent superconductors. These textures form below the depairing current, potentially causing oscillating and resistive switching effects in materials like MgB2.
Area of Science:
- Condensed Matter Physics
- Superconductivity Theory
Background:
- Multicomponent superconductors exhibit complex order parameters.
- Understanding current-induced phenomena is crucial for superconducting device applications.
Purpose of the Study:
- To predict the formation of equilibrium phase textures in multicomponent superconductors under applied dc current.
- To investigate the behavior of superconducting condensates and their phase-locking mechanisms.
Main Methods:
- Utilizing the two-component Ginzburg-Landau and Usadel equations.
- Modeling weakly coupled comoving superconducting condensates.
Main Results:
- Predicted current-induced formation of equilibrium phase textures.
- Identified breakdown of the phase-locked state at I > Ic1.
- Observed phase texture formation well below the depairing current (Id).
Conclusions:
- Phase textures can manifest in multilayer structures, Bose-Einstein condensates, and two-gap superconductors like MgB2.
- These textures may lead to observable oscillating and resistive switching effects.
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