Relation between structural instabilities in EuTiO_3 and SrTiO_3

A. Bussmann-Holder; J. Koehler; R. K. Kremer; J. M. Law

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Relation between structural instabilities in EuTiO_3 and SrTiO_3

机译：EuTiO_3和SrTiO_3中的结构不稳定性之间的关系

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Specific heat measurements and theoretical calculations reveal an intimate analogy between EuTiO_3 and SrTiO_3. For EuTiO_3, a hitherto unknown specific heat anomaly is discovered at temperatures TA = 282(1 )K, which is analogous to the well-known specific heat anomaly of SrTiO_3 at the temperature T_A = 105K caused by an antiferrodistortive transition. Because 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 EuTiO_3 to an antiferrodistortive phase transition. The higher transition temperature of EUTiO_3 as compared to SrTiO_3 results from spin-phonon coupling.

机译：比热测量和理论计算揭示了EuTiO_3和SrTiO_3之间的相似之处。对于EuTiO_3，在温度TA = 282（1）K时发现了迄今未知的比热异常，这类似于由反铁畸变转变引起的SrTiO_3在温度T_A = 105K时的比热异常。因为在两个系统中观察到的区域中心软声子模式可以用相同的参数建模，所以我们将EuTiO_3的新的282（1）K不稳定性归因于反铁畸变相变。与SrTiO_3相比，EUTiO_3的更高的转变温度归因于自旋声子耦合。

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来源
《Physical review》 |2011年第21期|p.212102.1-212102.4|共4页
作者
A. Bussmann-Holder; J. Koehler; R. K. Kremer; J. M. Law;
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作者单位

Max-Planck-lnstitute for Solid State Research, Heisenbergstr. 1, D-70569 Stuttgart, Germany;

Max-Planck-lnstitute for Solid State Research, Heisenbergstr. 1, D-70569 Stuttgart, Germany;

Max-Planck-lnstitute for Solid State Research, Heisenbergstr. 1, D-70569 Stuttgart, Germany;

Max-Planck-lnstitute for Solid State Research, Heisenbergstr. 1, D-70569 Stuttgart, Germany;

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phonons in crystal lattices; magnetomechanical and magnetoelectric effects, magnetostriction;

机译：晶格中的声子;磁机械和磁电效应;磁致伸缩;

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Relation between structural instabilities in EuTiO_3 and SrTiO_3

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