Research Progress in Positive Magnetoresistance System

近十几年来，磁致电阻效应及其机理的研究一直是凝聚态物理领域的研究热点之一。随着具有磁阻效应的各种新材料及新结构体系的合成、制备与发现，磁阻体系及其磁阻机制的复杂性也不断被展现出来。在已发现的各类磁阻体系及磁阻效应中，正磁阻体系及正磁阻效应的研究，作为磁阻研究的一个分支，在磁阻体系、磁阻机理和新型磁阻器件应用方面，均具有特殊的研究价值。本文综述了正磁阻体系、正磁阻效应及其磁阻机理的研究进展，展示了正磁阻体系、正磁阻效应及其机理的多样性，并简要指出了正磁阻体系研究中需要关注的一些共性问题。 Over the last decade, the research of magnetoresistance effect and its mechanism has been one of the research hotspot of condensed matter physics. With the synthesis, preparation and discovery of a variety of new materials and new structural systems which possess magnetoresistance effect, its mechanism and the complexity of magnetoresistance system are also constantly being unfolded. In all kinds of magnetoresistance system and magnetoresistance effect which have been found, the research of positive magnetoresistance system and positive magnetoresistance effect, as a branch of the magnetoresistance research system, has special research value in the magnetoresistance system, magnetoresistance mechanism and application of new magnetoresistive devices. This paper reviews the progress of positive magnetoresistance system, magnetoresistance effect and its mechanism, shows the diversity of the positive magnetoresistance system, positive magnetoresis-tance effect and its mechanism, and briefly points out some common problems that need to be fo-cused in the studies of the positive magnetoresistance system.