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

J. P. Hinton; 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; J. Orenstein

doi:10.1038/srep23610

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

J. P. Hinton, 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, J. Orenstein

Physics and Astronomy (Twin Cities)

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26 Scopus citations

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_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 HgBa₂CuO_4+δ (Hg-1201) and YBa₂Cu₃O_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.

Original language	English (US)
Article number	23610
Journal	Scientific reports
Volume	6
DOIs	https://doi.org/10.1038/srep23610
State	Published - Apr 13 2016

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Hinton, J. P., Thewalt, E., Alpichshev, Z., Mahmood, F., Koralek, J. D., Chan, M. K., Veit, M. J., Dorow, C. J., Barišić, N., Kemper, A. F., Bonn, D. A., Hardy, W. N., Liang, R., Gedik, N., Greven, M., Lanzara, A., & Orenstein, J. (2016). The rate of quasiparticle recombination probes the onset of coherence in cuprate superconductors. Scientific reports, 6, Article 23610. https://doi.org/10.1038/srep23610

Hinton, JP, Thewalt, E, Alpichshev, Z, Mahmood, F, Koralek, JD, Chan, MK, Veit, MJ, Dorow, CJ, Barišić, N, Kemper, AF, Bonn, DA, Hardy, WN, Liang, R, Gedik, N, Greven, M, Lanzara, A & Orenstein, J 2016, 'The rate of quasiparticle recombination probes the onset of coherence in cuprate superconductors', Scientific reports, vol. 6, 23610. https://doi.org/10.1038/srep23610

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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 Tc, 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, τqp, as a function of temperature and magnetic field in underdoped HgBa2CuO4+δ (Hg-1201) and YBa2Cu3O6+x (YBCO) single crystals by ultrafast time-resolved reflectivity. We find that τqp (T) exhibits a local maximum in a small temperature window near Tc 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 Tc 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.",

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T1 - The rate of quasiparticle recombination probes the onset of coherence in cuprate superconductors

AU - Hinton, J. P.

AU - Thewalt, E.

AU - Alpichshev, Z.

AU - Mahmood, F.

AU - Koralek, J. D.

AU - Chan, M. K.

AU - Veit, M. J.

AU - Dorow, C. J.

AU - Barišić, N.

AU - Kemper, A. F.

AU - Bonn, D. A.

AU - Hardy, W. N.

AU - Liang, Ruixing

AU - Gedik, N.

AU - Greven, M.

AU - Lanzara, A.

AU - Orenstein, J.

PY - 2016/4/13

Y1 - 2016/4/13

N2 - 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 Tc, 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, τqp, as a function of temperature and magnetic field in underdoped HgBa2CuO4+δ (Hg-1201) and YBa2Cu3O6+x (YBCO) single crystals by ultrafast time-resolved reflectivity. We find that τqp (T) exhibits a local maximum in a small temperature window near Tc 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 Tc 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.

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

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