Spin reorientation in easy-plane kagome ferromagnet Li_9Cr_3(P_2O_7)_3(PO_4)_2  

作　　者：董元浩 付盈 刘以轩 郝占阳 王乐 刘才 邓可 梅佳伟 Yuanhao Dong;Ying Fu;Yixuan Liu;Zhanyang Hao;Le Wang;Cai Liu;Ke Deng;Jiawei Mei(Shenzhen Institute for Quantum Science and Engineering,and Department of Physics,Southern University of Science and Technology,Shenzhen 518055,China;School of Physics,Xi’an Jiaotong University,Xi’an 710049,China;Department of Physics,Southern University of Science and Technology,Shenzhen 518055,China;Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices,Southern University of Science and Technology,Shenzhen 518055,China)

机构地区：[1]Shenzhen Institute for Quantum Science and Engineering,and Department of Physics,Southern University of Science and Technology,Shenzhen 518055,China [2]School of Physics,Xi’an Jiaotong University,Xi’an 710049,China [3]Department of Physics,Southern University of Science and Technology,Shenzhen 518055,China [4]Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices,Southern University of Science and Technology,Shenzhen 518055,China

出　　处：《Chinese Physics B》2023年第5期153-157,共5页中国物理B（英文版）

基　　金：Shenzhen Fundamental Research Program(Grant No.JCYJ20220818100405013)。

摘　　要：We report the successful growth and characterization of Li_9Cr_3(P_2O_7)_3(PO_4)_2single crystal,and investigate its magnetic properties under external magnetic fields via magnetization and heat capacity measurements.Our study reveals that Li_9Cr_3(P_2O_7)_3(PO_4)_2 is an easy-plane kagome ferromagnet with S=3/2,as evidenced by the Curie–Weiss temperature of 6 K which implies a ferromagnetic exchange coupling in the material.Under zero magnetic field,Li_9Cr_3(P_2O_7)_3(PO_4)_2 undergoes a magnetic transition at TC=2.7 K from a paramagnetic state to a ferromagnetically ordered state with the magnetic moment lying in the kagome plane.By applying a c-axis directional magnetic field to rotate the spin alignment from the kagome plane to the c-axis,we observe a reduction in the magnetic transition temperature as the field is increased.We construct a magnetic phase diagram as a function of temperature and magnetic field applied parallel to the c-axis of Li_9Cr_3(P_2O_7)_3(PO_4)_2 and find that the phase boundary is linear over a certain temperature range.Regarding that theoretically,the field-induced phase transition of the spin reorientation in the easy-plane ferromagnet can be viewed as the ferromagnetic magnon Bose–Einstein condensation(BEC),the phase boundary scaling of field-induced(B c)magnetic transition in Li_9Cr_3(P_2O_7)_3(PO_4)_2 can be described as the quasi-2D magnon BEC,which has been observed in other ferromagnetic materials such as K_2CuF_4.

关 键 词：kagome lattice flux method magnetic material spin-3/2 

分 类 号：O482.523[理学—固体物理]