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

doi:10.1103/PhysRevLett.103.097202

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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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 language	English (US)
Article number	097202
Journal	Physical review letters
Volume	103
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevLett.103.097202
State	Published - Aug 27 2009

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General Physics and Astronomy

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

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.",

author = "J. Tao and D. Niebieskikwiat and M. Varela and W. Luo and Schofield, {M. A.} and Y. Zhu and Salamon, {M. B.} and Zuo, {J. M.} and Pantelides, {S. T.} and Pennycook, {S. J.}",

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T2 - Relationship to colossal magnetoresistance

AU - Tao, J.

AU - Niebieskikwiat, D.

AU - Varela, M.

AU - Luo, W.

AU - Schofield, M. A.

AU - Zhu, Y.

AU - Salamon, M. B.

AU - Zuo, J. M.

AU - Pantelides, S. T.

AU - Pennycook, S. J.

PY - 2009/8/27

Y1 - 2009/8/27

N2 - 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.

AB - 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.

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

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