Thermoelectric power of Ba(Fe1-xCox)2As2, 0≤x≤0.05, and Ba(Fe1-xRhx)2As2, (0≤x≤0.171)
Abstract
Temperature-dependent, in-plane, thermoelectric power data are presented for single crystals of Ba(Fe1-xCox)2As2, 0≤x≤0.05, and Ba(Fe1-xRhx)2As2, (0≤x≤0.171). Given that previous thermoelectric power and angle resolved photoemission spectroscopy studies of Ba(Fe1-xCox)2As2 delineated a rather large Co-concentration range for Lifshitz transitions to occur, and the underdoped side of the phase diagram is poorly explored, new measurements of thermoelectric power on tightly spaced concentrations of Co, 0≤x≤0.05, were carried out. The data suggest evidence of a Lifshitz transition, but instead of a discontinuous jump in thermoelectric power between 0≤x≤0.05, a more gradual evolution in the S(T) plots as x is increased was observed. The thermoelectric power data of Ba(Fe1-xRhx)2As2 show very similar behavior to that of Co substituted BaFe2As2. The previously outlined T - x phase diagrams for both systems are further confirmed by these thermoelectric power data.
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