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Twinning Mlcrostructure and Charge Ordering in the Colossal Magnetoresistive Manganite Nd1/2Sr1/2MnO3

Published online by Cambridge University Press:  02 July 2020

Z. P. Luo ,
D. J. Miller  and
J. F. Mitchell
Z. P. Luo
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois60439, USA
D. J. Miller
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois60439, USA
J. F. Mitchell
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois60439, USA
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Charge ordering (C.O.) in the colossal magnetoresistive (CMR) manganites gives rise to an insulating, high-resistance state. This charge ordered state can be melted into a low-resistance metallic-like state by the application of magnetic field. Thus, the potential to attain high values of magnetoresistance with the application of small magnetic fields may be aided by a better understanding of the charge-ordering phenomenon. This study focused on microstructural characterization in Nd1/2Sr1/2MnO3. In Nd1/2Sr1/2MnO3, the nominal valence of Mn is 3.5+. On cooling, charge can localize and lead to a charge ordering between Mn 3+ and Mn 4+. The ordering of charge results in a superlattice structure and a reduction in symmetry.

Thin foil specimens were prepared from bulk samples by conventional thinning and ion milling (at LN2 temperature) methods. The TEM work was carried out in a Philips CM30 at 300 kV with a Gatan LN2 cold stage, and a JEM 4000EX with a resolution of 0.17 nm at 400 kV for HREM observation.

Type
Ceramics & Minerals
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 404 - 405
Copyright
Copyright © Microscopy Society of America

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References

References:

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4.) Supported by the U.S. Department of Energy, Division of Basic Energy Sciences-Material Sciences, under contract W-31-109-Eng-38.Google Scholar