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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:20260419T193850Z
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 N<sub>S
 </sub> and transition temperatures T<sub>c</sub>\, 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 T<sub>c</sub> with N<sub>S</sub>\, 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 La<sub
 >2-x</sub>Sr<sub>x</sub>CuO<sub>4</sub> 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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