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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1791
DTSTART:20100415T150000Z
DURATION:PT1H0M0S
DTSTAMP:20240329T065346Z
LAST-MODIFIED:20100409T141934Z
LOCATION:5310 Chamberlin
SUMMARY:Quantum Critical Behavior in Cuprate Superconductors\, R. G. H
erb Condensed Matter Seminar\, Tom Lemberger\, The Ohio State Universi
ty
DESCRIPTION:On the basis of measurements of superfluid density NS
and transition temperatures Tc\, we argue that the p
hysics of underdoped cuprates is dominated by fluctuations associated
with a quantum superconductor-to-insulator phase transition. "Thick" f
ilms exhibit 3D scaling of Tc with NS\, while ul
trathin films two unit cells thick exhibit the expected 2D scaling. Ob
servation of 3D fluctuations contradicts the well-known "Uemura relati
on" which holds that thick samples have 2D fluctuations. On the other
side of the cuprate phase diagram\, recent results on overdoped La2-xSrxCuO4 films show that these films su
ddenly become amazingly homogeneous\, possibly due to another quantum
phase transition. We'll speculate on what might be going on there.
URL:https://www.physics.wisc.edu/events/?id=1791
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