反铁磁性
凝聚态物理
电荷(物理)
订单(交换)
自旋(空气动力学)
材料科学
旋转玻璃
物理
热力学
量子力学
财务
经济
作者
S. Chowki,Sudhindra Rayaprol,Niharika Mohapatra
标识
DOI:10.1088/2053-1591/1/4/046113
摘要
The spinel oxide, LiMn2O4, although well known as a potential cathode material for Li rechargeable battery, exhibits complicated magnetic properties which are not completely understood. Here, we present comprehensive investigations of the magnetic properties of LiMn2O4, synthesized by a soft chemical sol–gel route. The results of magnetic susceptibility, magnetization, magnetic relaxation, heat capacity and neutron diffraction measurements as a function of temperature establish the coexistence of two magnetic phases at low temperature (TN ∼ 62 K); long range antiferromagnetic (AFM) ordered phase essentially arising due to Mn4+–Mn4+ interaction and short range ordered phase due to Mn3+–Mn3+ interaction, as a consequence of the partial charge ordering. Furthermore, the magnetic relaxation behavior below TN is consistent with the freezing of large magnetic clusters, the so called AFM super spins. The observed magnetic properties are discussed on the basis of charge order pattern mimicking strong spin–charge correlation.
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