Magnetoresistance and magnetic properties of the double perovskites

Rudolf Gross 1J.B. Philipp P. Majewski L. Alff A. Erb T. Graf 4J. Simon 2D.D. Sarma 3

1. Walther-Meissner-Institute (WMI), Walther-Meissner Str. 8, Garching D-85748, Germany
2. Institute for Anorganic Chemistry, Bonn D-53117, Germany
3. Indian Institute of Science, Bangalore 560 012, India
4. Technische Univ. München, Walter Schottky Institut, Am Coulombwall 3, Garching D-85748, Germany

Abstract

The Curie-temperature and the saturation magnetization of double perovskites is known to depend strongly on structural and electronic degrees of freedom. We have performed a a detailed experimental study of the system A2CrWO6 with A = Sr, Ba and Ca. The use of different alkaline earth ions with different ionic radii on the A site results in a significant variation of the tolerance factor. The Curie temperature of polycrystalline A2CrWO6 samples was found to be strongly reduced for Ca2CrWO6 and Ba2CrWO6 as compared to Sr2CrWO6 due to a tolerance factor significantly deviating from unity resulting in deviations from the ideal perovskite structure. Electron doping by La3+ substitution on the A site also reduces the Curie temperature and the saturation magnetization both due to disorder and band structure effects. We also have fabricated high quality epitaxial thin
films of Sr2CrWO6 and studied their magnetotransport properties [1,2].

[1] J.B. Philipp et al., Appl. Phys. Lett. 79, 3654 (2001).
[2] J.B. Philipp et al., J. Appl. Phys. 93, 6853 (2003).

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Presentation: invited oral at E-MRS Fall Meeting 2003, Symposium D, by Rudolf Gross
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-05-16 16:23
Revised:   2009-06-08 12:55
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