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SUMMARY:A TALE OF TWO METALS: CONTRASTING CRITICALITIES IN THE CUPRATES AN
 D PNICTIDES - Prof. Nigel Hussey\, Director of the Nijmegen High Magnetic 
 Field Laboratory
DTSTART:20180521T150000Z
DTEND:20180521T160000Z
UID:TALK106348@talks.cam.ac.uk
CONTACT:Romy Hall
DESCRIPTION:The iron-based high temperature superconductors share a number
  of similarities with their copper-based counterparts\, such as reduced di
 mensionality\, proximity to states of competing order\, and a critical rol
 e for 3d electron orbitals. Their respective temperature-doping phase diag
 rams also contain certain commonalities that have led to claims that the m
 etallic and superconducting properties of both families are governed by th
 eir proximity to a quantum critical point (QCP) located inside the superco
 nducting dome. In this presentation\, we critically examine these claims a
 nd highlight significant differences in the bulk physical properties of bo
 th systems. While there is now a large body of evidence supporting the pre
 sence of a magnetic QCP in the iron pnictides and a (possibly) nematic QCP
  in the iron chalcogenides\, the situation in the cuprates is much less ap
 parent\, at least for the end point of the pseudogap phase. We argue that 
 the opening of the normal state pseudogap in cuprates\, so often tied to a
  putative QCP\, arises from a\nmomentum-dependent breakdown of quasipartic
 le coherence that sets in at much higher doping levels but which is driven
  by the proximity to the Mott insulating state at half filling. Finally\, 
 we present a new scenario a new phase diagram for the cuprates\, whose ess
 ential element is the loss of quasiparticle integrity and its evolution wi
 th momentum\,\ntemperature and doping plays a key role in shaping the resu
 ltant phase diagram.
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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