Quantized spin waves in the metallic state of magnetoresistive manganites

Details Quantized spin waves in the metallic state of magnetoresistive manganites Quantized spin waves in the metallic state of magnetoresistive manganites

2008-12-09

arxiv.org/abs/0812.1715v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

High resolution spin waves measurements have been carried out in ferromagnetic (F) La(1-x)(Sr,Ca)xMnO3 with x(Sr)=0.15, 0.175, 0.2, 0.3 and x(Ca)=0.3. In all q-directions, close to the zone boundary, the spin wave spectra consist of several energy levels, with the same values in the metallic and the x\approx 1/8 ranges. Mainly the intensity varies, jumping from the lower energy levels determined in the x\approx 1/8 range to the higher energy ones observed in the metallic state. On the basis of a quantitative agreement found for x(Sr)=0.15 in a model of ordered 2D clusters, the spin wave anomalies of the metallic state can be interpreted in terms of quantized spin waves within the same 2D clusters, embedded in a 3D matrix.

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