Extrinsic giant magnetoresistance in chromium (IV) oxide, CrO2
Extrinsic giant magnetoresistance in chromium (IV) oxide, CrO2
复制标题
DOI：
10.1063/1.120616
复制
发表时间：
1998-06
影响因子：
4
通讯作者：
S. Manoharan;D. Elefant;G. Reiss;J. Goodenough
中科院分区：
文献类型：
--
作者：
S. Manoharan;D. Elefant;G. Reiss;J. Goodenough
多晶CrO2在低温下表现出巨磁电阻效应。随着温度的升高，GMR的快速降低与晶间电阻的降低相关。单晶CrO2是一种半金属铁磁体，因为数据被解释为反映两种类型的电荷载流子，穿过晶界：那些在相邻晶粒的导带之间隧穿的载流子和那些在与自旋弛豫时间相比长时间驻留在局域状态后跳跃的载流子。
Polycrystalline CrO2 is shown to exhibit a giant magnetoresistance (GMR) at low temperatures. A rapid decrease in the GMR with increasing temperature is correlated with a decrease in the intergranular resistance. Single-crystal CrO2 is a half-metallic ferromagnet, as the data are interpreted to reflect two types of charge carriers, crossing a grain boundary: those that tunnel between conduction bands of adjacent grains and those that hop after residing at a localized state for a time long compared to a spin relaxation time.