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Magneto-optical investigation of spin polarisation of La0.71Ca0.3MnO3 and La0.7Sr0.3MnO3
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2005 (English)In: Journal of Magnetism and Magnetic Materials, Vol. 290, 948-951 p.Article in journal (Refereed) Published
Abstract [en]

We investigate the ferromagnetic phase of thin epitaxial films of the CMR manganites La0.7Ca0.3MnO3 and La0.7Sr0.3MnO3 by temperature-dependent spectral generalised magneto-optical ellipsometry (SGME). The phase transitions from a paramagnetic insulator to a ferromagnetic metal take place at T-C ≈ 265 K and T-C ≈ 335 K, respectively. The measurements covering a spectral range of 0.5-5eV are performed in the temperature range of 25-425 K. SGME allows a complete magneto-optical characterisation consisting of the determination of the diagonal components as well as the off-diagonal components ε(xx) of the dielectric tensor within a single measurement. Upon cooling through the Curie temperature, we observe the development of a Drude-like free-carrier response in ε(xx), indicating the release of previously bound charges. Meanwhile, ε(xx) exhibits a rising magneto-optical response. This reflects, via the increasing degree of spin polarisation of the bands involved in optical transitions, the emergence of ferromagnetism. We tentatively assign spectral features between 2.5 and 4.5 eV to transitions involving the Mn-d shell, especially the e(g) and t(2g) levels. © 2004 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2005. Vol. 290, 948-951 p.
Identifiers
URN: urn:nbn:se:miun:diva-14363OAI: oai:DiVA.org:miun-14363DiVA: diva2:435756
Note
Times Cited: 1 SI Part 2 Joint European Magnetic Symposia (JEMS 04) SEP 05-10, 2004 Dresden, GERMANYAvailable from: 2011-08-19 Created: 2011-08-19 Last updated: 2011-11-27Bibliographically approved

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