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Ultrafast Raman thermometry in driven YBa2Cu3O6.48

T.-H. Chou1, M. Först1, M. Fechner1, M. Henstridge1,2, S. Roy1, M. Buzzi1, D. Nicoletti1, Y. Liu3, S. Nakata3 et al.

B. Keimer3 and A. Cavalleri1,4,*

  • 1Max Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany
  • 2SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
  • 3Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany
  • 4Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom

  • *andrea.cavalleri@mpsd.mpg.de
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Phys. Rev. B 109, 195141 – Published 13 May, 2024

DOI: https://doi.org/10.1103/PhysRevB.109.195141

Abstract

Signatures of photoinduced superconductivity have been reported in cuprate materials subjected to a coherent phonon drive. A “cold” superfluid was extracted from the transient Terahertz conductivity and was seen to coexist with “hot” uncondensed quasiparticles, a hallmark of a driven-dissipative system of which the interplay between coherent and incoherent responses is not well understood. Here, time resolved spontaneous Raman scattering was used to probe the lattice temperature in the photoinduced superconducting state of YBa2Cu3O6.48. An increase in lattice temperature of up to 140 K was observed by measuring the time dependent Raman scattering intensity of an undriven “spectator” phonon mode. This value is consistent with the estimated increase in quasiparticle temperature measured under the same excitation conditions. These temperature changes provide quantitative information on the nature of the driven state and its decay, and may suggest a strategy to optimize this effect.

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Phys. Rev. B 109, 195141– Published 13 May, 2024
  • Received 29 September 2023
  • Revised 18 April 2024
  • Accepted 22 April 2024
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by Max Planck Society.

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