Related Experiment Videos
Quantum critical fluctuations in disordered d-wave superconductors.
Julia S Meyer1, Igor V Gornyi, Alexander Altland
1Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany.
Physical Review Letters
|April 12, 2003
Summary
Static disorder in cuprates affects quasiparticle damping. The id-order parameter dynamics become diffusive, while is-order parameter fluctuations induce a secondary superconductor transition sensitive to impurity concentration.
Area of Science:
- Condensed matter physics
- Materials science
Background:
- Strong quasiparticle damping in cuprates is a key phenomenon.
- Previous models proposed coupling to fluctuating order parameters (id or is).
Purpose of the Study:
- Generalize existing models to include static disorder.
- Investigate the impact of disorder on quasiparticle damping and superconductivity.
Main Methods:
- Theoretical modeling of fluctuating order parameters in the presence of static disorder.
- Analysis of order parameter dynamics and phase transitions.
Main Results:
- In the id case, order parameter dynamics become diffusive, largely preserving clean-case phenomenology.
- In the is case, disorder and fluctuations lead to a secondary superconductor transition.
- The critical temperature of this secondary transition is exponentially sensitive to impurity concentration.
Conclusions:
- Disorder significantly modifies the behavior of fluctuating order parameters in cuprates.
- The id model shows resilience to disorder, while the is model exhibits a novel, highly sensitive superconducting transition.