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Title: Twinning microstructure and charge ordering in the colossal magnetoresistive manganite Nd{sub 1/2}Sr{sub 1/2}MnO{sub 3}

Abstract

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 Nd{sub 1/2}Sr{sub 1/2}MnO{sub 3}. In Nd{sub 1/2}Sr{sub 1/2}MnO{sub 3}, 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 LiqN{sub 2} temperature) methods. The room temperature TEM observation of Nd{sub 1/2}Sr{sub 1/2}MnO{sub 3} reveals that it contains a highly twinned microstructure, together with a small number of stacking faults (SFS). A figure shows the same area of the specimen at different zone axes obtained by tilting around two perpendicular directions as indicated. Three grains A, B and C are labeled for each of the zone axes. The room temperaturemore » EDPs from the matrix and twins shows an approximate 90{degree} rotation suggesting a 90{degree} twin orientation. These results are further confirmed by C.O. at low temperatures. The twinning planes can be determined by tilting with large angles.« less

Authors:
; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
755874
Report Number(s):
ANL/MSD/CP-101864
TRN: US0003633
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: Microscopy & Microanalysis 2000, Philadelphia, PA (US), 08/13/2000--08/17/2000; Other Information: PBD: 10 May 2000
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; NEODYMIUM OXIDES; STRONTIUM OXIDES; MANGANESE OXIDES; CHARGE CARRIERS; DISTRIBUTION; MAGNETORESISTANCE; SUPERLATTICES; TWINNING; ORDER PARAMETERS

Citation Formats

Luo, Z. P., Miller, D. J., and Mitchell, J. F. Twinning microstructure and charge ordering in the colossal magnetoresistive manganite Nd{sub 1/2}Sr{sub 1/2}MnO{sub 3}. United States: N. p., 2000. Web.
Luo, Z. P., Miller, D. J., & Mitchell, J. F. Twinning microstructure and charge ordering in the colossal magnetoresistive manganite Nd{sub 1/2}Sr{sub 1/2}MnO{sub 3}. United States.
Luo, Z. P., Miller, D. J., and Mitchell, J. F. Wed . "Twinning microstructure and charge ordering in the colossal magnetoresistive manganite Nd{sub 1/2}Sr{sub 1/2}MnO{sub 3}". United States. https://www.osti.gov/servlets/purl/755874.
@article{osti_755874,
title = {Twinning microstructure and charge ordering in the colossal magnetoresistive manganite Nd{sub 1/2}Sr{sub 1/2}MnO{sub 3}},
author = {Luo, Z. P. and Miller, D. J. and Mitchell, J. F.},
abstractNote = {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 Nd{sub 1/2}Sr{sub 1/2}MnO{sub 3}. In Nd{sub 1/2}Sr{sub 1/2}MnO{sub 3}, 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 LiqN{sub 2} temperature) methods. The room temperature TEM observation of Nd{sub 1/2}Sr{sub 1/2}MnO{sub 3} reveals that it contains a highly twinned microstructure, together with a small number of stacking faults (SFS). A figure shows the same area of the specimen at different zone axes obtained by tilting around two perpendicular directions as indicated. Three grains A, B and C are labeled for each of the zone axes. The room temperature EDPs from the matrix and twins shows an approximate 90{degree} rotation suggesting a 90{degree} twin orientation. These results are further confirmed by C.O. at low temperatures. The twinning planes can be determined by tilting with large angles.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}

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