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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:

1.)Mitchell, J.F. et al., Phys. Rev. B 54 (1996) 6172.CrossRefGoogle Scholar
2.)Radaelli, P.G., Cox, D.E., Marezio, M., and Cheong, S-W., Phys. Rev. B 55 (1997) 3015.CrossRefGoogle Scholar
3.)Woodward, P.M., Cox, D.E., Vogt, T., Rao, C.N.R., and Cheetham, A.K., Chem. Mater. 11 (1999) 3528.CrossRefGoogle Scholar
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