Analogies of structural instabilities in EuTiO3 and SrTiO3

Details Analogies of structural instabilities in EuTiO3 and SrTiO3 Analogies of structural instabilities in EuTiO3 and SrTiO3

2011-05-30

arxiv.org/abs/1105.6029v1

Physics

Condensed Matter

Strongly Correlated Electrons

PRB to be published, 12 pages, 3 Figures

Scientific paper

Specific heat measurements and theoretical calculations reveal an intimate analogy between EuTiO3 and SrTiO3. For EuTiO3 a hitherto unknown specific heat anomaly is discovered at TA=282(1)K which is analogous to the well known specific heat anomaly of SrTiO3 at TA=105K caused by an antiferrodistortive transition. Since the zone center soft phonon mode observed in both systems can be modeled with the same parameters we ascribe the new 282(1)K instability of EuTiO3 to an antiferrodistortive phase transition. The higher transition temperature of EuTiO3 as compared to SrTiO3 results from spin phonon coupling.

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