Quantum phase transition in quarter-filled nanoclusters of manganite induced by element substitution at B site  

作　　者：WANG HaiLong WANG RongMing WANG YuGang TIAN GuangShan 

机构地区：[1]School of Physics, Peking University, Beijing 100871, China [2]Key Laboratory of Micro-nano Measurement-Manipulation and Physics (Ministry of Education), Department of Physics, Beijing University of Aeronautics & Astronautics, Beijing 100191, China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2011年第7期1277-1282,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 50971011 and 10874003);the Beijing Natural Science Foundation (Grant No. 1102025);the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20091102110038)

摘　　要：In the present paper,we study the effect of element substitution for quarter-filled nanoclusters of perovskite manganite by introducing Jahn-Teller type of perturbation interaction to the double-exchange Hamiltonian.Using the unrestricted real-space Hartree-Fock approximation method we find that,the Jahn-Teller electron-phonon interaction plays the central role in producing the phase transition from ferromagnetic phase to CE type antiferromagnetic phase.Not only the Jahn-Teller interaction benefits antiferromagnetic correlation,it also increases the charge density order parameter.These theoretical results provide a guidance to predict the properties and modify the composition of particles of perovskite manganite under nano-scale.In the present paper, we study the effect of element substitution for quarter-filled nanoclusters of perovskite manganite by in- troducing Jahn-Teller type of perturbation interaction to the double-exchange Hamiltonian. Using the unrestricted real-space Hartree-Fock approximation method we find that, the Jahn-Teller electron-phonon interaction plays the central role in produc- ing the phase transition from ferromagnetic phase to CE type antiferromagnetic phase. Not only the Jahn-Teller interaction benefits antiferromagnetic correlation, it also increases the charge density order parameter. These theoretical results provide a guidance to predict the properties and modify the composition of particles of perovskite manganite under nano-scale.

关 键 词：MANGANITE charge ordered phases antiferromagnetic correlation 

分 类 号：TM27[一般工业技术—材料科学与工程] TB383[电气工程—电工理论与新技术]