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SUMMARY:NaxCoO2 and Related Oxides from the Perspective of their Electroni
 c Structures - David Singh\, Oak Ridge National Lab
DTSTART:20070523T101500Z
DTEND:20070523T111500Z
UID:TALK7211@talks.cam.ac.uk
CONTACT:Michael Sutherland
DESCRIPTION:The layered oxide\, NaxCoO2 shows a variety of behaviors that 
 make it the subject of\nmuch current debate. These include a complex phase
  diagram as a function of x. This\nphase diagram has compositions with mag
 netism\, metal insulator transitions\, and most\nremarkably\, exceedingly 
 high thermopower combined with high metallic conductivity.\nFurthermore\, 
 upon hydration\, the material becomes a superconductor whose nature is not
 \nyet well understood. The purpose of this talk is to introduce this compo
 und and its\nproperties using the electronic structure as a basis. Some pr
 operties\, such as the\nthermopower\, and magneto-thermopower\, appear to 
 be understandable at the level of\nstandard electronic structure theory\, 
 while others remain mysterious. Some related oxides\nthat may have propert
 ies similar to NaxCoO2 are discussed.
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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