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[资源] 【资源】《Science》2009年08月28日出品

《Science》2009年08月28日出品
Spectroscopic Fingerprint of Phase-Incoherent Superconductivity
in the Underdoped Bi2Sr2CaCu2O8+d
Jhinhwan Lee,1 K. Fujita, 1,2 A. R. Schmidt,1 Chung Koo Kim,1
H. Eisaki,3 S. Uchida,2 J. C. Davis1,4*
A possible explanation for the existence of the cuprate “pseudogap” stateisthatitisad-wave
superconductor without quantum phase rigidity. Transport and thermodynamic studies provide
compelling evidence that supports this proposal, but few spectroscopic explorations of it have been
made. One spectroscopic signature of d-wave superconductivity is the particle-hole symmetric “octet” of
dispersive Bogoliubov quasiparticle interference modulations. Here we report on this octet’sevolution
from low temperatures to well into the underdoped pseudogap regime. No pronounced changes occur
in the octet phenomenology at the superconductor’s critical temperature Tc, and it survives up to at
least temperature T ~1.5 Tc. In this pseudogap regime, we observe the detailed phenomenology that
was theoretically predicted for quasiparticle interference in a phase-incoherent d-wave superconductor.
Thus, our results not only provide spectroscopic evidence to confirm and extend the transport and
thermodynamics studies, but they also open the way for spectroscopic explorations of phase fluctuation
rates, their effects on the Fermi arc, and the fundamental source of the phase fluctuations that suppress
superconductivity in underdoped cuprates.

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