Magnetic phase diagrams and large magnetocaloric effects of the two-dimensional antiferromagnetic triangular lattice of Gd3+ ions in KBaGd(BO3)2

作     者：Song, Z.M. Zhao, N. Ge, H. Li, T.T. Yang, J. Wang, L. Fu, Y. Zhang, Y.Z. Wang, S.M. Mei, J.W. He, H. Guo, S. Wu, L.S. Sheng, J.M. 

作者机构：Department of Physics Southern University of Science and Technology Shenzhen518055 China Department of Chemsitry Southern University of Science and Technology Shenzhen518055 China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices Southern University of Science and Technology Shenzhen518055 China  Beijing100190 China International Quantum Academy Shenzhen518048 China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area Guangdong Shenzhen518045 China Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology Shenzhen518055 China 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2023年

核心收录：

主　　题：Specific heat 

摘      要：We report a detailed study of the magnetic properties of KBaGd(BO3)2, in which magnetic Gd3+ (S = 7/2) ions form into two-dimensional triangular layers. Magnetization, specific heat and magnetocaloric effect (MCE) measurements have been performed on KBaGd(BO3)2 single crystals. The results show that a long-range antiferromagnetic state is established below TN = 0.24 K. In zero fields, only about half of the full entropy is released at TN, indicating that not all the magnetic moments are frozen below the ordering temperature, as expected from the geometrical frustration of the triangular spin lattice. Further studies under external fields were performed down to 50 mK, and the magnetic phase diagrams are established with magnetic fields applied both within and perpendicular to the triangular plane. KBaGd(BO3)2 serves as an example of a two-dimensional triangular lattice with large spin values (S = 7/2) and can be directly compared with the isostructure KBaR(BO3)2 (R = Dy-Yb) family of doublet ground states, which exhibit effective spins of S = 1/2. Copyright © 2023, The Authors. All rights reserved.