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

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111 Citas (Scopus)

Resumen

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.

Idioma originalInglés
Número de artículo097202
PublicaciónPhysical Review Letters
Volumen103
N.º9
DOI
EstadoPublicada - 27 ago. 2009

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