Magnetic field expulsion in optically driven YBa2Cu3O6.48
S Fava1, G De Vecchi1, G Jotzu2
1Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany.
Nature
|July 10, 2024
Summary
Researchers observed transient diamagnetism in optically driven cuprates, suggesting enhanced superconducting correlations in the pseudogap phase. This finding helps distinguish superconducting-like states from mere increased carrier mobility.
Area of Science:
- Condensed Matter Physics
- Quantum Materials
- Non-Equilibrium Quantum Phenomena
Background:
- Coherent optical driving induces non-equilibrium quantum phases and transient phenomena in quantum solids.
- Cuprate superconductors exhibit transient superconducting-like optical properties when driven optically, even above their critical temperature (Tc).
- The microscopic nature of these transient states and their distinction from non-superconducting states remain unclear, particularly regarding Meissner diamagnetism.
Purpose of the Study:
- To investigate the presence of Meissner diamagnetism in optically driven cuprates.
- To clarify the microscopic nature of the transient superconducting-like state induced by coherent optical driving.
- To differentiate between a true transient superconducting state and a state with only enhanced carrier mobility.
Main Methods:
- Examined the time-dependent magnetic field surrounding an optically driven YBa2Cu3O6.48 crystal.
- Utilized Faraday rotation measurements in a nearby magneto-optic material to detect magnetic field changes.
- Applied constant magnetic fields and identical driving conditions known to induce superconducting-like optical properties.
Main Results:
- Observed a transient diamagnetic response in the optically driven YBa2Cu3O6.48 crystal.
- The magnitude of the diamagnetic response was comparable to that of an equilibrium type II superconductor.
- The observed diamagnetism (volume susceptibility χv of order -0.3) is inconsistent with a photo-induced increase in mobility alone.
Conclusions:
- The transient diamagnetic response provides evidence for superconductivity in the optically driven state.
- This finding supports the notion that coherent optical driving enhances or synchronizes incipient superconducting correlations within the pseudogap phase.
- The results help distinguish the observed phenomenon from a non-superconducting state with merely enhanced carrier mobility.
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