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.

在过去的几年中，对巨大磁性的研究揭示了引人入胜的新物理学，这对对强相关电子系统的理解产生了重大影响。该提案概述了研究最近在掺杂的Zncr2se4中发现的新的巨磁耐药机制（CMR）的研究，该机制与锰酸酯钙钛矿和pyrochlores报道的Zncr2se4截然不同，在低场中观察到了显着的效果，以及从未预言的跨界。阳性至负巨磁性（MR> 90％）与场和温度的函数。