1 Key Laboratory of Novel Materials for Sensor of Zhejiang Province, Institute of Material Physics, Hangzhou Dianzi University, Hangzhou 310018, China; 2 Guangxi Key Laboratory of Nuclear Physics and Nuclear Technology, Guangxi Normal University, Guilin 541004, China
Abstract Materials with strongly coupled magnetic and electronic degrees of freedom provide new possibilities for practical applications. In this paper, we have investigated the structure, magnetic property, and magnetodielectric (MD) effect in HoCuO and YbCuO polycrystalline samples, which possess a non-centrosymmetric polar structure with space group 2. In HoCuO, Ho and Cu sublattices order simultaneously, exhibiting a typical paramagnetic to antiferromagnetic transition at 13.1 K. While for YbCuO, two magnetic transitions which originate from the orderings of Yb (7.8 K) and Cu (13.5 K) sublattices are observed. A magnetic field induced metamagnetic transition is obtained in these two cuprates below Néel temperature (). By means of dielectric measurement, distinct MD effect is demonstrated by the dielectric anomaly at . Meanwhile, the MD effect is found to be directly related to the metamagnetic transition. Due to the specific spin configuration and different spin evolution in the magnetic field, a positive MD effect is formed in HoCuO, and a negative one is observed in YbCuO. The spontaneous dielectric anomaly at is regarded as arising from the shifts in optical phonon frequencies, and the magnetoelectric coupling is used to interpret the magnetic field induced MD effect. Moreover, an - phase diagram is constructed for HoCuO and YbCuO based on the results of isothermal magnetic and dielectric hysteresis loops.
Fund: Project supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 11704091), the Open Project of Guangxi Key Laboratory of Nuclear Physics and Nuclear Technology (Grant No. NLK2021-10), and the Open Project of Key Laboratory of Novel Materials for Sensor of Zhejiang Province, China (Grant No. ZJKLNMS2021010).
Corresponding Authors:
Shuai Huang, De-Xuan Huo
E-mail: huangshuai@hdu.edu.cn;dxhuo@hdu.edu.cn
Cite this article:
Hao Jin(金昊), Shuai Huang(黄帅), Kai-Qi Wan(万凯奇), Chang-Ming Zhu(朱长明),Hai-Ou Wang(王海欧), Kun-Peng Su(苏昆朋), and De-Xuan Huo(霍德璇) Magnetic ordering induced magnetodielectric effect in Ho2Cu2O5 and Yb2Cu2O5 2023 Chin. Phys. B 32 067504
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