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SUMMARY:Scattering\, Fermi surface reconstruction and the gap above Tc in 
 cuprate superconductors - James G. Storey.  Robinson Research Institute &a
 mp\; MacDiarmid Institute\,  Victoria University of Wellington\, New Zeala
 nd
DTSTART:20170517T101500Z
DTEND:20170517T111500Z
UID:TALK72618@talks.cam.ac.uk
CONTACT:Helen Verrechia
DESCRIPTION:A longstanding dispute in hole-doped cuprate high-temperature 
 superconductors concerns the origin of an energy gap\, known as the pseudo
 gap\, which persists high above the superconducting transition temperature
  (Tc). Does it represent precursor superconductivity\, or some other non-s
 uperconducting order? By examining a range of thermodynamic\, transport an
 d spectroscopic data I will demonstrate that the answer is “yes” to bo
 th. In the overdoped regime the non-mean-field temperature dependences are
  well described by a pairing gap extending above Tc in the presence of str
 ong scattering. While the underdoped data points to a second gap originati
 ng from a reconstruction of the Fermi surface in which the carrier density
  drops by one hole per copper atom. This implies that the phase diagram of
  the high-Tc cuprates is actually a blend of the two leading proposals\, a
 nd that the two opposing sides of this dispute are each partially correct.
  
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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