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B. Fisher,J. Genossar,K.B. Chashka,L. Patlagan,G.M. Reisner 한국물리학회 2007 Current Applied Physics Vol.7 No.2
We report on a comparative study ofS(T) for a series of transition-metal double-perovskites A2BB0O6 B0= transition metal ions), some of them known to have half-metallic ground states. For Sr2BB0O6 with BB0= CrMo, CrW, CrRe,FeMo, and FeRe (ferrimagnetic with high Curie temperatures),S(T) is metallic, for B0= Mo and W it is n-type and for B0= Re, p-type.For A2FeMoO 6 accompanied by prominent dierences in their (metallic)S(T). For the insulating Sr2MnReO 6 and Ba2MnReO 6, the onset of ferromag-netic order belowTc . 120 K is marked by a steep drop ofS(T) accompanied by only a slight change in the slope of lnq versus 1/T1/2.Signicant conclusions were drawn from the experimental results without the need for elaborate models.
Inter-grain tunneling conductivity of Sr2FeMoO6:effects of doping and grain-boundary modification
B.Fisher,G.M.Reisner,K.B.Chashka,L.Patlagan 한국물리학회 2004 Current Applied Physics Vol.4 No.5
The inter-grain conductivity (rGB) of polycrystalline and granular Sr2FeMoO6 (SFMO) increases linearly with temperature between liquid He to room temperature at least.This very unusual behavior motivated the new investigations reported here.It was found that rGB(T) is linear also for granular samples of La-doped SFMO and for sintered SFMO with modified grain boundaries(GBs), but it is nonlinear for granular samples of Ag- and Na-doped SFMO.The fluctuation-induced tunneling (FIT) model was successfully applied in the interpretation of both types of behavior.Current–voltage measurements were carried out on a resistive sample with oxygenated GBs, using pulsed high currents.The interpretation of the effect of a high electric field on transport, in terms of the FIT model, is discussed.