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Enhanced charge density wave coherence in a light-quenched, high-temperature superconductor
S Wandel1, F Boschini2,3,4, E H da Silva Neto5,6,7
1Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.
Science (New York, N.Y.)
|May 19, 2022
Summary
Superconductivity and charge density waves (CDWs) compete in cuprates. Ultrafast X-ray scattering reveals CDW correlations rapidly expand after superconductivity is quenched, suggesting superconductivity stabilizes CDW defects.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Superconductivity and charge density waves (CDWs) are competing orders in cuprate superconductors.
- Understanding their microscopic interdependence is crucial for materials science.
- A probe sensitive to their natural length and time scales is needed.
Purpose of the Study:
- To investigate the transient dynamics of CDW correlations in YBa2Cu3O6+y.
- To understand the microscopic interdependence between superconductivity and CDWs.
- To probe the interaction on its natural length and time scale.
Main Methods:
- Utilized ultrafast resonant soft X-ray scattering.
- Tracked transient evolution of CDW correlations.
- Applied an infrared laser pulse to quench superconductivity.
Main Results:
- Observed a nonthermal response of the CDW order.
- CDW correlation length nearly doubled within approximately 1 picosecond.
- Results align with a model of inhomogeneous interaction and disrupted spatial coherence.
Conclusions:
- Superconductivity plays a dominant role in stabilizing CDW topological defects.
- The interaction between superconductivity and CDWs is inhomogeneous.
- Disruption of spatial coherence is a key manifestation of this interaction.
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