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Effect of oxygen deficiency on Charge Ordering in La0.5Ca0.5MnO3-δ

Published online by Cambridge University Press:  02 July 2020

J. Tao ,
N. Jiang  and
J.C.H. Spence
J. Tao
Affiliation:
Physics Department, Arizona State University, Tempe, AZ85287-1504
N. Jiang
Affiliation:
Physics Department, Arizona State University, Tempe, AZ85287-1504
J.C.H. Spence
Affiliation:
Physics Department, Arizona State University, Tempe, AZ85287-1504
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Abstract

Elastically-filtered transmission electron diffraction patterns of La0.5Ca0.5MnO3-δ have been obtained between 105K to 288K using the Leo 912 Omega. On heating La0.5Ca0.5MnO3 undergoes a transition from antiferromagnetic insulator to ferromagnetic metal (TN ∼ 150K) and then to paramagnetic insulator (Tc ∼ 230K) . The q modulation wave vector along the b-axis direction arises from charge ordering of Mn3+ and Mn4+, and orbital ordering of dz22 orbitals associated with Jahn-Teller distortions in the Mn3+O6 octahedra at low temperature. Both the intensity and the position of superlattice peaks change as a function of temperature during heating. The large incommensurability we see between 105K to 260K differs from that seen previously and proposed model. Figure 1 a) shows the lattice constants a, b, c related to the simple perovskite lattice parameters ap (ap ∼ 3.9Å) by a≈b≈ap and c≈2ap, and indicates the octahedral coordination.

Type
Diffraction Techniques in TEM and SEM
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 376 - 377
Copyright
Copyright © Microscopy Society of America 2001

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