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The rate of quasiparticle recombination probes the onset of coherence in cuprate superconductors.
Hinton, J P; Thewalt, E; Alpichshev, Z; Mahmood, F; Koralek, J D; Chan, M K; Veit, M J; Dorow, C J; Barisic, N; Kemper, A F; Bonn, D A; Hardy, W N; Liang, Ruixing; Gedik, N; Greven, M; Lanzara, A; Orenstein, J.
Afiliação
  • Hinton JP; Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
  • Thewalt E; Department of Physics, University of California, Berkeley, California 94720, USA.
  • Alpichshev Z; Department of Physics, University of California, San Diego, California 92093, USA.
  • Mahmood F; Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
  • Koralek JD; Department of Physics, University of California, Berkeley, California 94720, USA.
  • Chan MK; Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
  • Veit MJ; Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
  • Dorow CJ; Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
  • Barisic N; Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.
  • Kemper AF; School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
  • Bonn DA; School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
  • Hardy WN; School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
  • Liang R; School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
  • Gedik N; Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria.
  • Greven M; Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
  • Lanzara A; Department of Physics, North Carolina State University, Raleigh, North Carolina 27695-7518, USA.
  • Orenstein J; Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada.
Sci Rep ; 6: 23610, 2016 Apr 13.
Article em En | MEDLINE | ID: mdl-27071712
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 HgBa2CuO(4+δ) (Hg-1201) and YBa2Cu3O(6+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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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2016 Tipo de documento: Article
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2016 Tipo de documento: Article