Spin-glass behavior in the competing CoCrGaO_(4)cubic spinel system  

作　　者：Jiyu Hu Jiangli Ni Zhenfa Zi Chaocheng Liu 

机构地区：[1]School of Physics and Materials Engineering,Hefei Normal University,Hefei 230009,China [2]National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230026,China

出　　处：《Nano Research》2025年第1期501-507,共7页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.12305369,12404129,22262013 and U1632161);High-level Talent Research Initiation Fund Project(No.2024rcjj03);the Project of Anhui Provincial Department of Education(Nos.2023AH010048 and gxbjZD2022050);the University Natural Science Research Project of Anhui Province(No.2023AH051278).

摘　　要：Spin glasses(SGs),generally defined as disordered systems with randomized competing interactions,are widely investigated complex phenomena.Discovering the ground states of spin glasses is crucial for understanding the nature of disordered magnets and many other physical manifestations,while also helping to solve some hard combinatorial optimization problems across multiple disciplines.However,the intrinsic cause of SG has always been elusive,especially in spinel oxide systems.Herein,we report the SG behavior observed in the cubic spinel oxides CoCrGaO_(4),and provide a comprehensive understanding of its intrinsic source.Magnetic results indicate a frustrated state under multi-magnetic competition,and the features of SG are confirmed by susceptibility tests.The fitting parameters ofτ0,T0,and zv of isothermal remanent magnetization further reveal the relaxation behavior and strong spin frustration.Furthermore,the varying exchange coupling under different temperatures and magnetic fields is unveiled,which should be responsible for the disordered state.Our studies unravel the underlying mechanism responsible for doping-induced magnetic frustration and introduce CoCrGaO_(4)as a potential platform for investigating spin glass behavior,thereby advancing fundamental research on frustrated magnetism within the spinel system.

关 键 词：spin glass(SG) magnetic frustration magnetic competition spinel ferrites 

分 类 号：TB33[一般工业技术—材料科学与工程]