The rate of quasiparticle recombination probes the onset of coherence in cuprate superconductors
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Hinton-2016-Rate of quasiparticle.pdf
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Author(s)
Hinton, J. P.
Thewalt, E.
Alpichshev, Zhanybek
Mahmood, Fahad
Koralek, J. D.
Chan, M. K.
Veit, M. J.
Dorow, C. J.
Barišić, N.
Kemper, A. F.
Date Issued
April 2016
Journal
Scientific Reports
Publisher
Springer Nature
Citation
Hinton, J. P., E. Thewalt, Z. Alpichshev, F. Mahmood, J. D. Koralek, M. K. Chan, M. J. Veit, C. J. Dorow, N. Barišić, A. F. Kemper, D. A. Bonn, W. N. Hardy, Ruixing Liang, N. Gedik, M. Greven, A. Lanzara, and J. Orenstein. "The rate of quasiparticle recombination probes the onset of coherence in cuprate superconductors." Scientific Reports 6, Article number: 23610 (2016), pp.1-9.
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Final published version
Abstract
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[subscript 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[subscript qp], as a function of temperature and magnetic field in underdoped HgBa[subscript 2]CuO[subscript 4+δ] (Hg-1201) and YBa[subscript 2]Cu[subscript 3]O[subscript 6+x] (YBCO) single crystals by ultrafast time-resolved reflectivity. We find that τ[subscript qp](T ) exhibits a local maximum in a small temperature window near T[subscript 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[subscript 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1038/srep23610
