Abstract
and underdoped YBa2Cu3O6.5 is found to be anomalous in that Rs(T.Tc)fiXs(T.Tc) in the pseudogap state. This implies plasmonlike response and negative permittivities «8(v),0 at microwave frequencies indicating non-Fermi-liquid transport in the ab plane. The anomalous microwave response is shown to arise from a collective mode characterized by a plasma frequency v pCM;0.1 eV and extremely low damping G CM ;10 25 ‐10 24 eV, distinctly different from those observed at optical frequencies.
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