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ESR of double-perovskite Sr2FeMoO6 |
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| Authors: | M T Causa A Butera M Tovar J Fontcuberta |
| Institution: | a Centro Atómico Bariloche, Comisión Nacional de Energía Atómica and Instituto Balseiro, Universidad Nacional de Cuyo, 8400 Bariloche, Río Negro, Argentina b Institut de Ciència de Materials de Barcelona, Consejo Superior de Investigación Científica, E-08193 Bellaterra, Catalunya, Spain |
| Abstract: | We present an ESR study of Sr2FeMoO6 in the paramagnetic region. A single line at g≈2 was associated with Fe3+ ions. The intensity follows Curie–Weiss law in the whole T range. For T >500 K a secondary line is attributed to ferromagnetic (FM) impurities. The line width is described by ΔHpp(T)=ΔHpp(∞)(1?Θ/T) with a high value for ΔHpp(∞). The absence of narrowing effects is a signature of double-exchange (DE) interactions and indicates that DE drives the FM ordering at a relatively high Tc. |
| Keywords: | Double exchange Magnetoresistant materials ESR |
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