Spin waves and phase transition on a magnetically frustrated square lattice with long-range interactions  

作　　者：谭宇婷 姚道新 Yuting Tan;Dao-Xin Yao(State Key Laboratory of Optoelectronic Materials and Technologies,Center for Neutron Science and Technology,Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices,School of Physics,Sun Yat-sen University,Guangzhou 510275,China)

机构地区：[1]State Key Laboratory of Optoelectronic Materials and Technologies,Center for Neutron Science and Technology,Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices,School of Physics,Sun Yat-sen University,Guangzhou 510275,China

出　　处：《Frontiers of physics》2023年第3期71-80,共10页物理学前沿（英文版）

基　　金：supported by NKRDPC2018YFA0306001,NKRDPC-2022YFA1402802,NSFC-92165204,NSFC-11974432,GBABRF-2019A1515011337,Shenzhen International Quantum Academy(Grant No.SIQA202102);Leading Talent Program of Guangdong Special Projects(No.201626003).

摘　　要：We investigate the effects of long-range interactions on the spin wave spectra and the competition between magnetic phases on a frustrated square lattice with large spin S.Applying the spin wave theory and assisted with symmetry analysis,we obtain analytical expressions for spin wave spectra of competing Neel and(π,0)stripe states of systems containing anyorder long-range interactions.In the specific case of long-range interactions with power-law decay,we find surprisingly that the staggered long-range interaction suppresses quantum fluctuation and enlarges the ordered moment,especially in the Neel state,and thus extends its phase boundary to the stripe state.Our findings illustrate the rich possibilities of the roles of long-range interactions,and advocate future investigations in other magnetic systems with different structures of interactions.

关 键 词：spin wave phase transition FRUSTRATION square lattice long-range interaction ANTIFERROMAGNET 

分 类 号：O57[理学—粒子物理与原子核物理]