Coexistence of intrinsic and extrinsic magnetoresistance in the double-perovskite Sr[sub 2]Fe(Mo[sub 1-x]W[sub x])O[sub 6-w] system

Lindén, J.; Yamamoto, T.; Nakamura, J.; Karppinen, M.; Yamauchi, H.
April 2001
Applied Physics Letters;4/30/2001, Vol. 78 Issue 18, p2736
Academic Journal
In a recent study, it was shown that by partially substituting Mo with W in the double-perovskite Sr[sub 2]FeMoO[sub 6-w] system, the magnetoresistivity can be enhanced. [K.-I. Kobayashi, T. Okuda, Y. Tomioka, T. Kimura, and Y. Tokura, J. Magn. Magn. Mater. 218, 17 (2000).] In order to explain the increase in the magnetoresistivity a series of W-substituted Sr[sub 2]Fe(Mo[sub 1-x]W[sub x])O[sub 6-w] samples with 0≤x≤1 was synthesized. Upon increasing the W content, the samples began to exhibit coexistence of paramagnetism and ferrimagnetism at 300 K. Signatures of antiferromagnetic ordering appeared around T[sub N]approx. 50 K for x>=0.6. In samples with 0.7≤x≤0.8 a broad peak was observed in the magnetoresistance data at temperatures corresponding to the Néel temperature. The peak was found to have its origin in the colossal magnetoresistance effect. The W-substituted samples were partially ferrimagnetic and therefore also exhibited the tunneling-type magnetoresistance, which is characteristic of pure Sr[sub 2]FeMoO[sub 6-w]. The coexistence of the two types of magnetoresistance effect is responsible for the enhancement of the overall magnetoresistance value. A slight enhancement in the magnetoresistance values around 300 K for the strongly W-substituted samples was found to be related to a second colossal magnetoresistance peak related to the para- to ferrimagnetic transition at T[sub c]. © 2001 American Institute of Physics.


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