Ramesha, K. ; Smolyaninova, V. N. ; Gopalakrishnan, J. ; Greene, R. L. (1998) ALaMn2O6-y (A= K, Rb): novel ferromagnetic manganites exhibiting negative giant magnetoresistance Chemistry of Materials, 10 (5). pp. 1436-1439. ISSN 0897-4756
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Official URL: http://pubs.acs.org/doi/abs/10.1021/cm970813v
Related URL: http://dx.doi.org/10.1021/cm970813v
Abstract
We report the synthesis of a new series of manganese oxides, ALaMn2O6-y, for A = K, Rb, and Cs, that adopt an ordered superstructure of the perovskite. The K and Rb phases are tetragonal (at ~ 7.75, ct ~ 7.10 Å) and the Cs phase is orthorhombic (a0 = 5.511, b0 = 5.468, c = 7.311 Å) indicating 2ap × 2ap and √2ap × √2ap × 2ap (ap = perovskite subcell) superstructures, respectively. The K and Rb phases are ferromagnetic (Tc~327 and 300 K) metals, exhibiting a giant magnetoresistance behavior similar to alkaline earth metal substituted lanthanide manganites. The results reveal that it is possible to induce Mn(III)/ Mn(IV) mixed valency and the related electronic properties through anion deficiency in ordered perovskites of the kind ALaMn2O6.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Chemical Society. |
| ID Code: | 12936 |
| Deposited On: | 11 Nov 2010 08:23 |
| Last Modified: | 02 Jun 2011 11:09 |
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