Observation of out-of-phase bilayer plasmons in $YBa_{2}Cu_{3}O_{7-delta}$

M. Grüninger*, D. van der Marel, A. A. Tsvetkov, A. Erb

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Published in: Phys. Rev. Lett. 84 (2000) 1575 Citing articles (CrossRef) citations recorded in [Science Citation Index] Abstract: The temperature dependence of the c-axis optical conductivity sigma(ømega) of optimally and overdoped YBa_2Cu_3O_x (x=6.93 and 7) is reported in the far- (FIR) and mid-infrared (MIR) range. Below T_c we observe a transfer of spectral weight from the FIR not only to the condensate at ømega = 0, but also to a new peak in the MIR. This peak is naturally explained as a transverse out-of-phase bilayer plasmon by a model for sigma(ømega) which takes the layered crystal structure into account. With decreasing doping the plasmon shifts to lower frequencies and can be identified with the surprising and so far not understood FIR feature reported in underdoped bilayer cuprates.
Original languageEnglish
Pages (from-to)1575 - 1578
Number of pages4
JournalPhysical Review Letters
Volume84
Issue number7
DOIs
Publication statusPublished - 2000

Keywords

  • C-AXIS RESPONSE
  • OPTICAL PHONONS
  • CRYSTAL-GROWTH
  • SUPERCONDUCTORS

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