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Optically induced superconductivity in stripedLa2−xBaxCuO4by polarization-selective excitation in the near infrared
- Source :
- Physical Review B. 90
- Publication Year :
- 2014
- Publisher :
- American Physical Society (APS), 2014.
-
Abstract
- We show that superconducting interlayer coupling, which coexists with and is depressed by stripe order in La1.885Ba0.115CuO4, can be enhanced by excitation with near-infrared laser pulses. For temperatures lower than Tc = 13 K, we observe a blue-shift of the equilibrium Josephson plasma resonance, detected by terahertz-frequency reflectivity measurements. Key to this measurement is the ability to probe the optical properties at frequencies as low as 150 GHz, detecting the weak interlayer coupling strengths. For T > Tc a similar plasma resonance, absent at equilibrium, is induced up to the spin-ordering temperature TSO = 40 K. These effects are reminiscent but qualitatively different from the light-induced superconductivity observed by resonant phonon excitation in La1.675Eu0.2Sr0.125CuO6.5. Importantly, enhancement of the below-Tc interlayer coupling and its appearance above Tc are preferentially achieved when the near-infrared pump light is polarized perpendicular to the superconducting planes, likely due to more effective melting of stripe order and the less effective excitation of quasiparticles from the Cooper pair condensate when compared to in-plane excitation.
- Subjects :
- Superconductivity
Physics
Condensed matter physics
Phonon
Condensed Matter Physics
Laser
Polarization (waves)
Electronic, Optical and Magnetic Materials
law.invention
law
Condensed Matter::Superconductivity
Quasiparticle
Perpendicular
Condensed Matter::Strongly Correlated Electrons
Cooper pair
Excitation
Subjects
Details
- ISSN :
- 1550235X and 10980121
- Volume :
- 90
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi...........2cee54ddb3fe703201a2f64a5917e4a1
- Full Text :
- https://doi.org/10.1103/physrevb.90.100503