Experimental evidence for field-induced metamagnetic transition of EuCd_(2)As_(2)  

作　　者：Yingkai Sun Yong Li Shuaishuai Li Changjiang Yi Hanbin Deng Xin Du Limin Liu Changjiang Zhu Yuan Li Zheng Wang Hanqing Mao Youguo Shi Rui Wu 

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Physical Sciences,University of Chinese Academy of Sciences,Bejing 100049,China [3]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China [4]Songshan Lake Materials Laboratory,Dongguan 523808,China

出　　处：《Journal of Rare Earths》2022年第10期1606-1610,共5页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(11227903,12004416,U2032204);the Beijing Municipal Science and Technology Commission(Z181100004218007,Z191100007219011);the National Basic Research Program of China(2015CB921304);the National Key Research and Development Program of China(2017YFA0302903,2016YFJC010282,2016YFA0300602,2016YFA0300604);the Strategic Priority Research Program of Chinese Academy of Sciences(XDB07000000,XDB28000000,XDB33000000);。

摘　　要：Recent studies have shown that layered compound EuCd_(2)As_(2) could exhibit diverse topological states depending on the different magnetic structures,such as Weyl semimetal,Dirac semimetal and topological insulato r.In order to further study the interplay between magnetism and topology of EuCd_(2)As_(2),it is necessary to figure out its magnetic structure.Here,by magnetization(M) measurements and negative magnetostriction(λ) along the [001] direction measured by scanning tunneling microscopy on EuCd_(2)As_(2) single crystals,we observe field-induced metamagnetic phase transition from A-type antiferromagnetic(AFM) ground state to field-polarized state,with canted AFM(CAFM) state in between.Magnetization and magnetostriction are more sensitive to the in-plane field than the out-of-plane field,indicating the magnetic moments lying in the ab plane.The absence of abrupt jump on M-H and λ-H curves demonstrates that the phase transition is a second-order type.In CAFM state,M increases linearly with the field and λ is proportional to M~2.Tunneling conductance spectra show the field-induced evolution of the electronic density of states.Our results provide experimental evidence for understanding the magnetic structure of EuCd_(2)As_(2).

关 键 词：Metamagnetic phase transitions MAGNETOSTRICTION Scanning tunneling microscopy/spectroscopy Rare earths 

分 类 号：O469[理学—凝聚态物理]