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
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© 2001 AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the authors and the American Institute of Physics. The following article appeared in Applied Physics Letters. Volume 78, Issue 18 and may be found at http://scitation.aip.org/content/aip/journal/apl/78/18/10.1063/1.1366357.
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School of Chemical Technology |
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2001
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Mcode
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Language
en
Pages
2736-2738
Series
Applied Physics Letters, Volume 78, Issue 18
Abstract
In a recent study, it was shown that by partially substituting Mo with W in the double-perovskite Sr2FeMoO6−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 Sr2Fe(Mo1−xWx)O6−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 TN≈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 magnetoresistanceeffect. The W-substituted samples were partially ferrimagnetic and therefore also exhibited the tunneling-type magnetoresistance, which is characteristic of pure Sr2FeMoO6−w. The coexistence of the two types of magnetoresistanceeffect 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 Tc.Description
Keywords
ferrimagnetism, magnetoresistance, molybdenum, perovskites
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Citation
Lindén, J. & Yamamoto, T. & Nakamura, J. & Karppinen, Maarit & Yamauchi, H.. 2001. 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. Applied Physics Letters. Volume 78, Issue 18. 2736-2738. ISSN 0003-6951 (printed). DOI: 10.1063/1.1366357.