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Cited by 292Physics of Superconductivity and MagnetismMagnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter Physics

Optically induced coherent transport far aboveTcin underdopedYBa2Cu3O6+δ

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Kaiser, S., Hunt, C. R., Nicoletti, D., Hu, W., Gierz, I., Liu, H. Y., Le Tacon, M., Loew, T. +3 more·2014·Physical Review B
DOI 10.1103/physrevb.89.184516
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Abstract

We report on a photoinduced transient state of ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{2}$O${}_{6+\ensuremath{\delta}}$ in which transport perpendicular to the Cu-O planes becomes highly coherent. This effect is achieved by excitation with mid-infrared optical pulses, tuned to the resonant frequency of apical oxygen vibrations, which modulate both lattice and electronic properties. Below the superconducting transition temperature ${T}_{c}$, the equilibrium signatures of superconducting interlayer coupling are enhanced. Most strikingly, the optical excitation induces a new reflectivity edge at higher frequency than the equilibrium Josephson plasma resonance, with a concomitant enhancement of the low-frequency imaginary conductivity ${\ensuremath{\sigma}}_{2}(\ensuremath{\omega})$. Above ${T}_{c}$, the incoherent equilibrium conductivity becomes highly coherent, with the appearance of a reflectivity edge and a positive ${\ensuremath{\sigma}}_{2}(\ensuremath{\omega})$ that increases with decreasing frequency. These features are observed up to room temperature in ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{2}$O${}_{6.45}$ and ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{2}$O${}_{6.5.}$ The data above ${T}_{c}$ can be fitted by hypothesizing that the light establishes a transient superconducting state over only a fraction of the solid, with a lifetime of a few picoseconds. Non-superconducting transport could also explain these observations, although one would have to assume transient carrier mobilities near 10${}^{4}$ cm${}^{2}$/V sec at 100 K, with a density of charge carriers similar to the below-${T}_{c}$ superfluid density. Our results are indicative of highly unconventional nonequilibrium physics and open new prospects for optical control of complex solids.

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  • In YBa2Cu3Oy, the signal is enhanced when the pump is tuned to specific phonon resonances, but if the photoconductivity saturates more easily at these resonances, the signal enhancement could be caused by changes in d_eff instead of ∆σ_s.

    “Furthermore, this signal is enhanced when the pump is tuned to specific phonon resonances, but if the photoconductivity saturates more easily at these resonances, the signal enhancement could be caused by changes in d eff instead of ∆ σ s [10, 18].”

    From Optical Saturation Produces Spurious Evidence for Photoinduced Superconductivity in K 3 C 60 (2023) · cites this paper as [10]

    The discussion of Fig. 6 says the photoinduced response is observed in resonance with the IR-active apical oxygen mode at 15 μm, supporting the resonance-dependent enhancement. Our copy does not establish that photoconductivity saturates more easily at that resonance or that a change in d_eff, rather than Δσ_s, could explain the enhancement. (LLM, conf=0.86)

    Experimental — accuracy not yet measured

  • In YBa2Cu3Oy, a signal associated with photoinduced superconductivity appears to show a linear dependence on the peak electric field, but the dependence is also consistent with what we have described for a saturable medium.

    “In YBa2Cu3O y , for example, a signal associated with photoinduced superconductivity appears to show a linear dependence on the peak electric field, but the dependence is also consistent with what we have described for a saturable medium [10, 18, 22].”

    From Optical Saturation Produces Spurious Evidence for Photoinduced Superconductivity in K 3 C 60 (2023) · cites this paper as [10]

  • Assuming a Debye model, the specific heat is proportional to T^3, so the local temperature will increase by approximately ∆T ∝ E^{1/4}.

    “Assuming a Debye model, for example, the specific heat is proportional to T 3 , so the local temperature will increase by approximately ∆ T ∝ E 1 / 4 [8, 10].”

    From Optical Saturation Produces Spurious Evidence for Photoinduced Superconductivity in K 3 C 60 (2023) · cites this paper as [10]

    The paper’s discussion of temperature-dependent optical properties (section labeled Abstract; page unavailable) concerns plasma frequency and the fraction of material transformed by light, not heat capacity or local heating. Searches for “Debye,” “specific heat,” and an energy-to-temperature scaling found no passage in our copy stating C ∝ T³ or ΔT ∝ E^(1/4). (LLM, conf=0.73)

    Experimental — accuracy not yet measured

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References 55 · Cited by 292

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Authors
Kaiser, S., Hunt, C. R., Nicoletti, D., Hu, W., Gierz, I., Liu, H. Y., Le Tacon, M., Loew, T., Haug, D., Keimer, B., & Cavalleri, A.
Affiliations
  • Max Planck Society (DE)
  • Max Planck Institute for Solid State Research (DE)
ORCID
Venue
Physical Review B
Publisher
American Physical Society (APS)
Published
2014-05-30
Volume
89
Issue
18
ISSN
  • 1098-0121 (ISSN-L)
  • 1550-235X
DOI
10.1103/physrevb.89.184516
OpenAlex
W1633442599
Cited by
292
References
55
Citations by year
2026: 18 · 2025: 19 · 2024: 17 · 2023: 17 · 2022: 25 · 2021: 26 · 2020: 35 · 2019: 21 · 2018: 24 · 2017: 25 · 2016: 30 · 2015: 25 · 2014: 10
FWCI
19.34
Type
journal article
Language
en
Open access
Licence
link.aps.org/licenses/aps-default-license (vor)
Locations
  • Physical Review B (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • Max Planck Digital Library (submittedVersion, other-oa)
  • Desy publication database (The Deutsches Elektronen-Synchrotron) (submittedVersion, other-oa)
  • MPG.PuRe (Max Planck Society) (submittedVersion, other-oa)
  • arXiv (Cornell University)
Funders
  • European Commission (2007–2013, FP7 2007-2013, 319286, FP7/2007)
  • FP7 Ideas: European Research Council (319286)
Topics
  • Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Physics of Superconductivity and Magnetism
  • Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Magnetic and transport properties of perovskites and related materials
  • Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Advanced Condensed Matter Physics
Keywords
underdoped cuprates, photoinduced superconductivity, coherent transport, mid-infrared excitation, interlayer coupling, Josephson plasma resonance, imaginary conductivity, nonequilibrium superconductivity, high-temperature superconductors

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