期刊
PHYSICAL REVIEW LETTERS
卷 103, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.097202
关键词
-
资金
- Office of Basic Energy Sciences
- Division of Materials Sciences and Engineering
- ORNL
- ORISE
- U. S. DOE/BES [DE-AC02-98CH10886]
- Vanderbilt University
- U. S. DOE [DE-FG02-07ER46453, DE-FG02-07ER46471]
A nanoscale phase is known to coincide with colossal magnetoresistance (CMR) in manganites, but its volume fraction is believed to be too small to affect CMR. Here we provide scanning-electron-nanodiffraction images of nanoclusters as they form and evolve with temperature in La1-xCaxMnO3, x=0.45. They are not doping inhomogeneities, and their structure is that of the bulk compound at x=0.60, which at low temperatures is insulating. Their volume fraction peaks at the CMR critical temperature and is estimated to be 22% at finite magnetic fields. In view of the known dependence of the nanoscale phase on magnetic fields, such a volume fraction can make a significant contribution to the CMR peak.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据