Thursday, June 18, 2009, 1:30 pm — Small Seminar Room, Bldg. 510
An overview of the recent work on structural, thermodynamic and transport measurements on Ba(Fe1-xTMx)2As2 (TM = Co, Ni, Cu, Rh, Pd) will be presented and temperature-doping phase diagrams for these families will be analyzed.
Evolution of the thermoelectric power and Hall coefficient with electron doping possibly point to a significant modification of the shape/curvature or topology of the Fermi surface of Ba(Fe1-xTMx)2As2 at small electron doping, that e.g. in the case of Co-doping coincides with, and probably gives rise to, the onset of superconductivity. Remarkably, a similar change is found in the Cu-doped samples at comparable extra electron count value, even though these compounds do not superconduct.
The whole body of the available data suggest that (a) suppression of the structural / magnetic phase transition and (b) the establishment of a proper extra electron count are each necessary but, individually, not sufficient conditions for superconductivity in electron-doped BaFe2As2.
Hosted by: Cedomir Petrovic
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