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Title: Ultrafast Raman thermometry in driven YBa 2 C u 3 O 6.48

Journal Article · · Physical Review. B
ORCiD logo [1]; ORCiD logo [2];  [2];  [3];  [2];  [2];  [2]; ORCiD logo [4];  [4];  [4];  [5]
  1. Max Planck Institute for the Structure and Dynamics of Matter, Hamburg (Germany); SLAC
  2. Max Planck Institute for the Structure and Dynamics of Matter, Hamburg (Germany)
  3. Max Planck Institute for the Structure and Dynamics of Matter, Hamburg (Germany); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
  4. Max Planck Institute for Solid State Research, Stuttgart (Germany)
  5. Max Planck Institute for the Structure and Dynamics of Matter, Hamburg (Germany); Univ. of Oxford (United Kingdom)

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 YBa2⁢C⁢u3⁢O6.48. 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.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
2404906
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 19 Vol. 109; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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