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Title: The rate of quasiparticle recombination probes the onset of coherence in cuprate superconductors

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep23610· OSTI ID:1252487
 [1];  [2];  [3];  [3];  [4];  [5];  [5];  [5];  [5];  [6];  [7];  [7];  [7];  [3];  [5];  [8];  [8]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States); Univ. of California, San Diego, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  5. Univ. of Minnesota, Minneapolis, MN (United States)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); North Carolina State Univ., Raleigh, NC (United States)
  7. Univ. of British Columbia, Vancouver (Canada); Canadian Inst. Adv. Res., Toronto, ON (Canada)
  8. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)

In the underdoped copper-oxides, high-temperature superconductivity condenses from a nonconventional metallic "pseudogap" phase that exhibits a variety of non-Fermi liquid properties. Recently, it has become clear that a charge density wave (CDW) phase exists within the pseudogap regime. This CDW coexists and competes with superconductivity (SC) below the transition temperature T c , suggesting that these two orders are intimately related. Here we show that the condensation of the superfluid from this unconventional precursor is reflected in deviations from the predictions of BSC theory regarding the recombination rate of quasiparticles. We report a detailed investigation of the quasiparticle (QP) recombination lifetime, τ qp , as a function of temperature and magnetic field in underdoped HgBa 2 CuO 4+δ (Hg-1201) and YBa 2 Cu 3 O 6+x (YBCO) single crystals by ultrafast time-resolved reflectivity. We find that τ qp (T) exhibits a local maximum in a small temperature window near T c that is prominent in underdoped samples with coexisting charge order and vanishes with application of a small magnetic field. We explain this unusual, non-BCS behavior by positing that T c marks a transition from phase-fluctuating SC/CDW composite order above to a SC/CDW condensate below. Our results suggest that the superfluid in underdoped cuprates is a condensate of coherently-mixed particle-particle and particle-hole pairs.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515; SC0006858; AC02-05CH11231
OSTI ID:
1252487
Alternate ID(s):
OSTI ID: 1379285
Journal Information:
Scientific Reports, Vol. 6; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

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Cited By (11)

Hidden Pair-Density-Wave Order in Cuprate Superconductors journal January 2019
Percolative nature of the direct-current paraconductivity in cuprate superconductors journal September 2018
Collapse of superconductivity in cuprates via ultrafast quenching of phase coherence journal April 2018
Intimate link between charge density wave, pseudogap and superconducting energy scales in cuprates journal April 2019
Local particle-hole pair excitations by SU(2) symmetry fluctuations journal June 2017
Light-induced nonequilibrium response of the superconducting cuprate La 2 x Sr x CuO 4 journal September 2019
Clocking the onset of bilayer coherence in a high- T c cuprate journal January 2017
Synchrotron x-ray scattering study of charge-density-wave order in HgBa 2 CuO 4 + δ journal October 2017
Synchrotron X-Ray Scattering Study of Charge-Density-Wave Order in $HgBa_{2}CuO_{4+δ}$ text January 2017
Collapse of superconductivity in cuprates via ultrafast quenching of phase coherence text January 2017
Universal superconducting precursor in the cuprates text January 2017

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