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Magnetoresistance in granular : Effects of variation in crystallographic and magnetic microstructure
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) RH isotherms at 5 K measured on pure exhibiting negative MR of the order of 15%. Inset shows %MR derived from RH scans remains negative and unhysteretic till about 200 K. (b) RH isotherms measured at 250 K for the same sample: The forward cycle exhibits a positive MR and strong history effects are seen in subsequent field scans. (c) RH isotherm (circles) for the same sample at 300 K exhibiting negative . Data as obtained on a sample of pure prepared in a different batch is shown for the sake of comparison (stars).

Image of FIG. 2.
FIG. 2.

(Color online) Magnetoresistance at 5, 100, 200, and 290 K recorded on (a) composite and (b) composite. History effects together with the observation of positive MR are seen above 200 K in both the samples. The qualitative features in magnetotranport in these highly diluted composites also remain similar to that of pure .

Image of FIG. 3.
FIG. 3.

(Color online) (a)–(c) displays RH isotherms at 5 K measured in zero field cooled and field cooled condition for pure and on two different composites. Inset show corresponding MH isotherms for each sample. Pure does not exhibit any measurable difference in the FC and ZFC state at lower temperatures. On the contrary, increasing the mass fraction of the AFM insulator leads to the greater change in zero field resistance.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetoresistance in granular CrO2: Effects of variation in crystallographic and magnetic microstructure