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Photoenhanced metastable c-axis electrodynamics in stripe-ordered cuprate LaBaCuO. | LitMetric

AI Article Synopsis

  • - Quantum materials can be manipulated with light, allowing for alterations in their macroscopic properties, particularly in superconductivity, which is intriguing for enhancing coherent behavior in copper-oxide superconductors.
  • - Researchers used terahertz time-domain spectroscopy to study LaBaCuO (x = 0.115) after it was excited with near-infrared pulses, finding significant increases in superconductivity indicators, showing that light can create a nonthermal change in charge order.
  • - The effects of light manipulation were long-lasting (over 300 ps) and showed spatial variations, suggesting that LaBaCuO has a strong response to nonequilibrium conditions and demonstrates clear photoinduced changes in the competition between different superconducting orders. *

Article Abstract

Quantum materials are amenable to nonequilibrium manipulation with light, enabling modification and control of macroscopic properties. Light-based augmentation of superconductivity is particularly intriguing. Copper-oxide superconductors exhibit complex interplay between spin order, charge order, and superconductivity, offering the prospect of enhanced coherence by altering the balance between competing orders. We utilize terahertz time-domain spectroscopy to monitor the c-axis Josephson plasma resonance (JPR) in LaBaCuO (x = 0.115) as a direct probe of superconductivity dynamics following excitation with near-infrared pulses. Starting from the superconducting state, c-axis polarized excitation with a fluence of 100 μJ/cm results in an increase of the far-infrared spectral weight by more than an order of magnitude as evidenced by a blueshift of the JPR, interpreted as resulting from nonthermal collapse of the charge order. The photoinduced signal persists well beyond our measurement window of 300 ps and exhibits signatures of spatial inhomogeneity. The electrodynamic response of this metastable state is consistent with enhanced superconducting fluctuations. Our results reveal that LaBaCuO is highly sensitive to nonequilibrium excitation over a wide fluence range, providing an unambiguous example of photoinduced modification of order-parameter competition.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6778182PMC
http://dx.doi.org/10.1073/pnas.1908368116DOI Listing

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