Direct observation of nanoscale phase separation in la 1-xca xmno 3 using scanning electron nanodiffraction

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

doi:10.1017/S1431927609097608

Direct observation of nanoscale phase separation in la _1-xca _xmno ₃ using scanning electron nanodiffraction

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

Producción científica: Contribución a una revista › Artículo › revisión exhaustiva

Idioma original	Inglés
Páginas (desde-hasta)	750-751
Número de páginas	2
Publicación	Microscopy and Microanalysis
Volumen	15
N.º	SUPPL. 2
DOI	https://doi.org/10.1017/S1431927609097608
Estado	Publicada - jul. 2009
Publicado de forma externa	Sí

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@article{c343badf99a547368ae4d36ba798b5d3,

title = "Direct observation of nanoscale phase separation in la 1-xca xmno 3 using scanning electron nanodiffraction",

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

note = "Funding Information: In this talk, we report the direct observations of the CO nanoscale phase using scanning electron nanodiffraction (SEND). This technique employs an electron probe ~ 1.7 nm in size and which is scanned over the manganite crystals. At each location of the scanning area, an electron nanodiffraction (END) pattern was recorded by a CCD camera, showing the CO superlattice reflections (Fig. 1A, corresponding to the electron probe sitting on the CO nanoscale phase) or no CO superlattice reflection (Fig. 1B, corresponding to the electron probe sitting off the CO nanoscale phase). By mapping the intensity of the CO superlattice reflections, the CO phase in the form of nanoclusters was revealed in real space (Fig. 2). The evolution of the CO nanoclusters during the phase transitions at various doping levels was studied using the SEND maps at different temperatures. We estimated the volume fraction of the CO phase as a function of temperature from the SEND maps and the appearance of CO nanoclusters correlates with the CMR effect. Moreover, the mechanism of the formation of the CO nanoclusters and the discovery of an anomalous short range CO in these materials will be discussed. [2] [1]. P. Dai et al., Phys. Rev. Lett. 85, 2553 (2000); C. P. Adams et al., ibid. 85, 3954 (2000); J. M. Zuo, J. Tao, Phys. Rev. B 63, 060407 (2001) [2]. Research sponsored by the Office of Basic Energy Sciences, Division of Materials Sciences and Engineering and by appointment to the ORNL Postdoctoral Research Program administered jointly by ORNL and ORISE. Work at BNL was supported by the U.S. DOE/BES under Contract No. DE-AC02-98CH10886.",

year = "2009",

month = jul,

doi = "10.1017/S1431927609097608",

language = "Ingl{\'e}s",

volume = "15",

pages = "750--751",

journal = "Microscopy and Microanalysis",

issn = "1431-9276",

number = "SUPPL. 2",

}

TY - JOUR

T1 - Direct observation of nanoscale phase separation in la 1-xca xmno 3 using scanning electron nanodiffraction

AU - Tao, J.

AU - Niebieskikwiat, D.

AU - Varela, M.

AU - Luo, W.

AU - Schofield, M.

AU - Zhu, Y.

AU - Salamon, M. B.

AU - Pantelides, S. T.

AU - Zuo, J. M.

AU - Pennycook, S. J.

N1 - Funding Information: In this talk, we report the direct observations of the CO nanoscale phase using scanning electron nanodiffraction (SEND). This technique employs an electron probe ~ 1.7 nm in size and which is scanned over the manganite crystals. At each location of the scanning area, an electron nanodiffraction (END) pattern was recorded by a CCD camera, showing the CO superlattice reflections (Fig. 1A, corresponding to the electron probe sitting on the CO nanoscale phase) or no CO superlattice reflection (Fig. 1B, corresponding to the electron probe sitting off the CO nanoscale phase). By mapping the intensity of the CO superlattice reflections, the CO phase in the form of nanoclusters was revealed in real space (Fig. 2). The evolution of the CO nanoclusters during the phase transitions at various doping levels was studied using the SEND maps at different temperatures. We estimated the volume fraction of the CO phase as a function of temperature from the SEND maps and the appearance of CO nanoclusters correlates with the CMR effect. Moreover, the mechanism of the formation of the CO nanoclusters and the discovery of an anomalous short range CO in these materials will be discussed. [2] [1]. P. Dai et al., Phys. Rev. Lett. 85, 2553 (2000); C. P. Adams et al., ibid. 85, 3954 (2000); J. M. Zuo, J. Tao, Phys. Rev. B 63, 060407 (2001) [2]. Research sponsored by the Office of Basic Energy Sciences, Division of Materials Sciences and Engineering and by appointment to the ORNL Postdoctoral Research Program administered jointly by ORNL and ORISE. Work at BNL was supported by the U.S. DOE/BES under Contract No. DE-AC02-98CH10886.

PY - 2009/7

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DO - 10.1017/S1431927609097608

M3 - Artículo

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SN - 1431-9276

VL - 15

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JO - Microscopy and Microanalysis

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