Ferromagnetism and increased ionicity in epitaxially grown TbMnO3 films

Details Ferromagnetism and increased ionicity in epitaxially grown TbMnO3 films Ferromagnetism and increased ionicity in epitaxially grown TbMnO3 films

2008-10-28

arxiv.org/abs/0810.5137v1

Physics

Condensed Matter

Materials Science

REVTeX, 5 two-column pages, 4 EPS figures

Scientific paper

10.1103/PhysRevB.79.014416

Thin films of TbMnO3 have been grown on SrTiO3 substrates. The films grow under compressive strain and are only partially clamped to the substrate. This produces remarkable changes in the magnetic properties and, unlike the bulk material, the films display ferromagnetic interactions below the ordering temperature of ~40K. X-ray photoemission measurements in the films show that the Mn-3s splitting is 0.3eV larger than that of the bulk. Ab initio embedded cluster calculations yield Mn-3s splittings that are in agreement with the experiment and reveal that the larger observed values are due to a larger ionicity of the films.

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