Direct imaging of nanoscale phase separation in La0.55Ca0.45MnO3: Relationship to colossal magnetoresistance

J. Tao, D. Niebieskikwiat, M. Varela, W. Luo, M. A. Schofield, Y. Zhu, M. B. Salamon, J. M. Zuo, S. T. Pantelides, S. J. Pennycook

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
Article number097202
JournalPhysical review letters
Volume103
Issue number9
DOIs
StatePublished - Aug 27 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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