Disrupting long-range polar order with an electric field
Disrupting long-range polar order with an electric field
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DOI：
10.1103/physrevb.93.174114
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发表时间：
2016-05
影响因子：
3.7
通讯作者：
Hanzheng Guo;Xiaomin Liu;F. Xue;Long-Qing Chen;Wei Hong;X. Tan
中科院分区：
文献类型：
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作者：
Hanzheng Guo;Xiaomin Liu;F. Xue;Long-Qing Chen;Wei Hong;X. Tan
已知电场通过电偶极子相对于库仑力的排列而有利于长程极序。因此，观察到由电场从有序态诱导的无序极性态将是令人惊讶的。在这里，我们展示了这样一个不寻常的现象，在多晶氧化物电场诱导铁电弛豫相变。具有无序偶极子的非遍历弛豫相在铁电相的极化反转期间在电场下作为中间态出现。使用唯象理论，这种意想不到的行为的潜在机制可以归因于铁电到弛豫相变的缓慢动力学，以及其对电反转期间的畴切换的竞争。所展示的材料也可以作为一个模型系统来研究一阶相变中的瞬态阶段;缓慢的动力学不需要使用复杂的超快工具。
Electric fields are known to favor long-range polar order through the aligning of electric dipoles in relation to Coulomb's force. Therefore, it would be surprising to observe a disordered polar state induced from an ordered state by electric fields. Here we show such an unusual phenomenon in a polycrystalline oxide where electric fields induce a ferroelectric-to-relaxor phase transition. The nonergodic relaxor phase with disordered dipoles appears as an intermediate state under electric fields during polarization reversal of the ferroelectric phase. Using the phenomenological theory, the underlying mechanism for this unexpected behavior can be attributed to the slow kinetics of the ferroelectric-to-relaxor phase transition, as well as its competition against domain switching during electric reversal. The demonstrated material could also serve as a model system to study the transient stages in first-order phase transitions; the slow kinetics does not require the use of sophisticated ultrafast tools.