Related Experiment Videos
Josephson effect in fulde-ferrell-larkin-ovchinnikov superconductors
1National High Magnetic Field Laboratory and Department of Physics, Florida State University, Tallahassee, Florida 32310, USA.
Physical Review Letters
|September 16, 2000
Summary
The Josephson current between Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) and BCS superconductors is suppressed but can be recovered with a magnetic field. This magnetic field effect allows for the detection and momentum measurement of the FFLO state.
Area of Science:
- Condensed Matter Physics
- Superconductivity
Background:
- Josephson junctions are crucial for studying superconductivity.
- Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconductors exhibit unique superconducting order parameters.
- The interplay between FFLO and conventional BCS superconductors presents unique phenomena.
Purpose of the Study:
- To investigate the suppression of Josephson current in FFLO-BCS junctions.
- To explore the possibility of recovering the Josephson current using magnetic fields.
- To establish the Josephson effect as a method for detecting and characterizing FFLO states.
Main Methods:
- Theoretical analysis of Josephson current in FFLO-BCS junctions.
- Investigating the effect of applied magnetic fields on supercurrent.
- Correlating magnetic field response with FFLO order parameter properties.
Main Results:
- Josephson current is suppressed due to differing superconducting order parameter momenta.
- Applying a magnetic field can restore the suppressed Josephson current.
- The critical magnetic field strength and direction are dependent on FFLO order parameter momentum and structure.
Conclusions:
- The Josephson effect in FFLO-BCS junctions is sensitive to the FFLO state.
- Magnetic field-induced supercurrent recovery offers a direct method for FFLO detection.
- This technique enables precise measurement of the FFLO order parameter momentum.