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SUMMARY:Computational Studies of Realistic Multiband Models of the Copper 
 Oxides - Cedric Weber (TCM)
DTSTART:20110511T102000Z
DTEND:20110511T110000Z
UID:TALK31488@talks.cam.ac.uk
CONTACT:Dubois Simon
DESCRIPTION:High temperature superconductivity was achieved by introducing
  holes in a parent compound consisting of copper oxide layers separated by
  spacer layers. It is possible to dope some of the parent compounds with e
 lectrons\, and their physical properties are bearing some similarities but
  also significant differences from the hole doped counterparts. Here\, we 
 use a modern first principles method\, to study the electron doped cuprate
 s and elucidate the deep physical reasons why their behavior is so differe
 nt than the hole doped materials. We find that electron doped compounds ar
 e Slater insulators\, e.g. a material where the insulating behavior is the
  result of the presence of magnetic long range order. This is in sharp con
 trast with\nthe hole doped materials\, where the parent compound is a Mott
  charge transfer insulator\, namely a material which is insulating due to 
 the strong electronic correlations but not due to the magnetic order. In p
 articular\, we point out that both hole and electron doped compounds are l
 ocated close to the charge-transfer insulator to metal transition\, and we
  discuss the consequences for optical and specific heat measurements done 
 for the normal state\, and additional consequences for the magnetic and su
 perconducting\n=orders of electron and hole doped copper oxides.\n\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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