Superelastic softening in perovskites

W. Schranz

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Superelastic softening in perovskites

机译：钙钛矿中的超弹性软化

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Contrary to high frequency (MHz-GHz) elastic data, at low frequencies (0.1-50 Hz) huge elastic softening (superelasticity) is usually found in the low symmetry improper ferroelastic phases (i.e., tetragonal or rhombohedral) of perovskite structured materials including SrTiO_3, KMn_(1-x)Ca_xF_3, and LaAlO_3. This giant elastic softening is caused by domain wall motion and can be suppressed with uniaxial stress. Taking into account the long range interaction of needle shaped domains and the repulsion between domain walls of finite thickness a free energy is constructed. The temperature variation of the elastic susceptibility is calculated which yields perfect fitting of the data. Within this soliton model we can also describe the measured effect of applied stress.

机译：与高频（MHz-GHz）弹性数据相反，在低频（0.1-50 Hz）时，钙钛矿结构材料（包括SrTiO_3）的低对称不当铁磁弹性相（即四方或菱面体）通常会发现巨大的弹性软化（超弹性）。，KMn_（1-x）Ca_xF_3和LaAlO_3。这种巨大的弹性软化是由畴壁运动引起的，并且可以通过单轴应力来抑制。考虑到针状磁畴的长程相互作用和有限厚度磁畴壁之间的排斥，构造了自由能。计算出弹性率的温度变化，可以完美拟合数据。在此孤子模型中，我们还可以描述施加应力的测量效果。

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《Physical review》 |2011年第9期|p.094120.1-094120.8|共8页
作者
W. Schranz;
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University of Vienna, Faculty of Physics, Physics of Functional Materials, Boltzmanngasse 5, A-1090 Wien, Austria;

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正文语种 eng
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mechanical properties of solids; anelasticity; internal friction; stress relaxation; and mechanical resonances; grain and twin boundaries; surface and interface dynamics and vibrations;

机译：固体的机械性能;无弹性内部摩擦压力松弛和机械共振;晶界和孪晶界;表面和界面的动力学和振动;

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Superelastic softening in perovskites

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