Crossover from Positive to Negative Colossal Magnetoresistance

从正巨磁阻到负巨磁阻的交叉

• 批准号: EP/D505429/2
• 负责人: Mark Green
• 金额: --
• 依托单位: University College London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2007
• 资助国家: 英国
• 起止时间: 2007 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FD505429%2F2
• 关键词: Crossover; Positive; Negative; Colossal; Magnetoresistance

In the past few years, the study of colossal magnetoresistance has unveiled fascinating new physics that has had a major impact on the understanding of strongly correlated electron systems. This proposal outlines research to investigate a new mechanism for colossal magnetoresistance (CMR) recently discover in doped ZnCr2Se4, which is vastly different to that reported for both manganate perovskites and pyrochlores, with a significant effect observed in low fields as well as an unprecedented crossover from positive to negative colossal magnetoresistance (MR > 90 %) as a function of both field and temperature.

在过去的几年里，对巨磁电阻的研究揭示了令人着迷的新物理学，对强相关电子系统的理解产生了重大影响。本提案概述了研究最近在掺杂ZnCr2Se4中发现的巨磁电阻（CMR）新机制的研究，这与锰酸钙钛矿和焦绿石的报道有很大不同，在低场中观察到显著的影响，并且从正到负的巨磁电阻（MR bbb90 %）作为场和温度的函数出现了前所未有的交叉。