Large Magneto-piezoelectric Effect in EuMnBi2 Single Crystal at Low Temperatures
Large Magneto-piezoelectric Effect in EuMnBi2 Single Crystal at Low Temperatures
复制标题
EuMnBi2单晶低温下的大磁压电效应
DOI：
10.1038/s41598-020-64530-2
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发表时间：
2020
影响因子：
4.6
通讯作者：
Shintaro lshiwata
中科院分区：
文献类型：
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作者：
Yuki Shiomi;Hidetoshi Masuda;Hidefumi Takahashi;Shintaro lshiwata
磁压电效应（MPE）是指缺乏时间反转和空间反转对称性的磁性金属在电流作用下产生应变的现象。最近的一篇实验论文证明了反铁磁金属EuMnBi2at 77 K的MPE，但MPE测量的有限温度范围阻碍了对MPE的详细讨论。本文将测量温度范围扩展到液体He温度，并在极低温范围内研究了MPE对激光位置、电流频率和振幅以及温度的依赖关系。我们发现MPE信号在低温下增强，并且在Eu和Mn离子的反铁磁有序态中达到最大值。在4.5 K时，MPE的有效压电系数估计高达3500 pC/N，远远大于典型压电陶瓷的压电系数，尽管由于高电流下的强焦耳加热，实际MPE位移的大小应该受到限制。本研究结果为实现新型无铅压电材料开辟了一条新途径。
Magneto-piezoelectric effect (MPE) refers to generation of strain in response to electric currents in magnetic metals which lack both time-reversal and space-inversion symmetries. A recent experimental paper demonstrated the MPE in the antiferromagnetic metal EuMnBi2at 77 K, but the limited temperature range of the MPE measurement hampered detailed discussion on the MPE. Here we extend the measurement temperature range down to liquid He temperature, and studied the dependences of the MPE on the laser position, frequency and amplitude of electric currents, and temperature in the very low temperature range. We show that the MPE signal is enhanced at low temperatures and reaches a maximum magnitude in the antiferromagnetically ordered states of both Eu and Mn ions. An effective piezoelectric coefficient for the MPE at 4.5 K is estimated to be as large as 3500 pC/N, which is much larger than piezoelectric coefficients of typical piezoelectric ceramics, although the magnitude of real MPE displacements should be limited due to strong Joule heating at high electric currents. The present results may open up a new strategy to realize new lead-free piezoelectric materials.