Spin reorientation in easy-plane kagome ferromagnet Li9Cr3(P2O7)3(PO4)2
Yuanhao Dong(董元浩)1, Ying Fu(付盈)2, Yixuan Liu(刘以轩)3, Zhanyang Hao(郝占阳)3, Le Wang(王乐)1, Cai Liu(刘才)1, Ke Deng(邓可)1, and Jiawei Mei(梅佳伟)1,4,†
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
Abstract We report the successful growth and characterization of LiCr(PO)(PO) single crystal, and investigate its magnetic properties under external magnetic fields via magnetization and heat capacity measurements. Our study reveals that LiCr(PO)(PO) is an easy-plane kagome ferromagnet with , as evidenced by the Curie-Weiss temperature of 6 K which implies a ferromagnetic exchange coupling in the material. Under zero magnetic field, LiCr(PO)(PO) undergoes a magnetic transition at K from a paramagnetic state to a ferromagnetically ordered state with the magnetic moment lying in the kagome plane. By applying a -axis directional magnetic field to rotate the spin alignment from the kagome plane to the -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 -axis of LiCr(PO)(PO) 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 () magnetic transition in LiCr(PO)(PO) can be described as the quasi-2D magnon BEC, which has been observed in other ferromagnetic materials such as KCuF.
Fund: Project supported by Shenzhen Fundamental Research Program (Grant No. JCYJ20220818100405013).
Corresponding Authors:
Jiawei Mei
E-mail: meijw@sustech.edu.cn
Cite this article:
Yuanhao Dong(董元浩), Ying Fu(付盈), Yixuan Liu(刘以轩), Zhanyang Hao(郝占阳), Le Wang(王乐), Cai Liu(刘才), Ke Deng(邓可), and Jiawei Mei(梅佳伟) Spin reorientation in easy-plane kagome ferromagnet Li9Cr3(P2O7)3(PO4)2 2023 Chin. Phys. B 32 057506
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