Electric polarization along the c axis in the ferroelectric helimagnetic phase of CuFe1－xGaxO2 (x=0.035)
Electric polarization along the c axis in the ferroelectric helimagnetic phase of CuFe1－xGaxO2 (x=0.035)
复制标题
CuFe1－xGaxO2（x=0.035）铁电螺旋磁相沿c轴的电极化
DOI：
10.1103/physrevb.90.085109
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发表时间：
2014
影响因子：
3.7
通讯作者：
and Noriki Terada
中科院分区：
文献类型：
--
作者：
Chikafumi Kaneko;Taro Nakajima;Setsuo Mitsuda;Yoshikazu Tanaka;and Noriki Terada
三角晶格反铁磁体具有椭圆螺旋型磁序，自发极化“垂直”于轴，特别是沿着晶体的[110]方向。在本研究中，我们对进行了热释电测量，揭示了铁电相也表现出“平行”于轴的自发电极化。虽然铁电极化沿着[110]方向是由三角（或单斜）晶体结构的对称性与螺旋型磁序自然导致的，但的出现并不是微不足道的。为了了解的起源，我们已经完善了晶体结构的共振x射线衍射测量附近的吸收边ofandions。我们还使用先前的球形中子偏振测量的结果重新分析了铁电相中的磁结构[Nakajima，Phys. Rev. B 79，214423（2009）PRBMDO 1098 -012110.1103/PhysRevB.79.214423]。在精细的磁性和晶体结构的基础上，我们讨论了出现的微观机制。
A triangular lattice antiferromagnethas been known to exhibit an elliptic screw-type magnetic ordering with spontaneous electric polarization “perpendicular” to theaxis, specifically along the [110] direction of the crystal. In the present study, we have performed pyroelectric measurements on, revealing that the ferroelectric phase also exhibits spontaneous electric polarization “parallel” to theaxis. While the ferroelectric polarization along the [110] direction is naturally led from the symmetry of the trigonal (or monoclinic) crystal structure with the screw-type magnetic ordering, the emergence ofis not trivial. To understand the origin of, we have refined the crystal structure by means of resonant x-ray diffraction measurements near the-absorption edges ofandions. We have also reanalyzed the magnetic structure in the ferroelectric phase using the results of the previous spherical neutron polarimetry [Nakajima , Phys. Rev. B 79, 214423 (2009)PRBMDO1098-012110.1103/PhysRevB.79.214423]. On the basis of the refined magnetic and crystal structures, we have discussed the microscopic mechanism for the emergence of.