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Condensed Matter Colloquium Thursday, February 3, 2011

Summary: Condensed Matter Colloquium
Thursday, February 3, 2011
2 pm, Room 1201
Refreshments at 1:30 pm in Room 1305F
Dr. Ni Ni
Princeton University
Physical properties of the Ba(Fe1-xTMx)2As2 series and related layered
antiferromagnetic oxyselenides R2O3T2Se2
The phase diagrams of single crystalline Ba(Fe1-xTMx)2As2 (TM = Co, Ni, Cu, Cu/Co, Rh,
Pd) series will be discussed in this talk. Hall, Seebeck coefficient and recent ARPES
measurements suggests the application of the rigid band approximation in these
series. Quantitative analysis of the detailed temperature-dopant concentration (T-x)
and temperature-extra electrons (T-e) phase diagrams of these series shows that
there exists a limited range of the number of extra electrons added, inside which the
superconductivity can be stabilized if the structural and magnetic phase transitions are
suppressed enough. Moreover, I will compare the temperature-doping with
temperature-pressure phase diagram. This comparison further reinforces the
conclusion that the Tc in the underdoped side is related to the suppression of the
structural / magnetic phase transition, but for the overdoped side Tmax-C is
determined by e. I will also talk about a structurally and chemically related series,


Source: Appelbaum, Ian - Department of Physics, University of Maryland at College Park


Collections: Engineering; Materials Science