scholarly journals From double exchange to superexchange in charge ordering perovskite manganites

1998 ◽  
Author(s):  
W. Bao ◽  
J.D. Axe ◽  
C.H. Chen ◽  
S.W. Cheong ◽  
P. Schiffer ◽  
...  
Keyword(s):  
Double Exchange ◽  
Charge Ordering ◽  
Perovskite Manganites

scholarly journals From double exchange to superexchange in charge-ordering perovskite manganites

1997 ◽  
Vol 241-243 ◽  
pp. 418-420 ◽  
Author(s):  
Wei Bao ◽  
J.D Axe ◽  
C.H Chen ◽  
S.-W Cheong ◽  
P Schiffer ◽  
...  
Keyword(s):  
Double Exchange ◽  
Charge Ordering ◽  
Perovskite Manganites

SPIN AND ORBITAL PHYSICS IN MANGANITES

2001 ◽  
Vol 15 (19n20) ◽  
pp. 2727-2745 ◽  
Author(s):  
R. Y. GU ◽  
Z. D. WANG
Keyword(s):  
Colossal Magnetoresistance ◽  
Lattice Distortion ◽  
Double Exchange ◽  
Charge Ordering ◽  
Perovskite Manganites ◽  
Electronic Correlation ◽  
Strong Electronic Correlation ◽  
Jahn Teller ◽  
Orbital Physics ◽  
Magnetic Orbital

The spin and orbital physics in perovskite manganites is briefly reviewed. Perovskite manganites are well known as the materials exhibiting colossal magnetoresistance (CMR), whose mechanism is based on the double exchange (DE) interaction, in which the electron hopping is connected with the spin configurations of the manganite ions. Recent intensive studies have shown that this DE framework must be subjected to the strong correlation between orbital degenerate electrons. On one hand, the orbital degeneracy itself leads to an anisotropic DE hopping being different from the conventional DE, which in turn may result in the anisotropy of the magnetic structure, such as the A-type or the C-type antiferromagnetism. On the other hand, the electronic correlation between these degenerate electrons plays an important role in determining the phases of the system. The correlation can come from both the on-site Coulomb interaction and the Jahn–Teller coupling between the lattice distortion and the electrons. The interplay of the DE mechanism and the strong electronic correlation leads to various magnetic, orbital and/or charge ordering as well as the phase separation.

The rich physics of A-site-ordered quadruple perovskite manganites AMn7O12

2021 ◽  
Author(s):  
Alexei A. Belik ◽  
Roger D Johnson ◽  
Dmitry Khalyavin
Keyword(s):  
Perovskite Structure ◽  
Double Exchange ◽  
Perovskite Manganites ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Jahn Teller ◽  
The Rich ◽  
A Site ◽  
Small Polarons

Perovskite-structure AMnO3 manganites played an important role in the development of numerous physical concepts such as double exchange, small polarons, electron-phonon coupling, and Jahn−Teller effects, and they host a variety...

Competition between the double exchange and charge ordering interactions in the bandwidth controlled (La,Nd)0.8Na0.2MnO3 manganites

2004 ◽  
Vol 351 (1-2) ◽  
pp. 114-120 ◽  
Author(s):  
Z.Q Li ◽  
H Liu ◽  
X.D Liu ◽  
P Wu ◽  
H.L Bai ◽  
...  
Keyword(s):  
Double Exchange ◽  
Charge Ordering

Pressure effects on charge-ordering transitions in Perovskite manganites

1997 ◽  
Vol 55 (12) ◽  
pp. 7549-7556 ◽  
Author(s):  
Y. Moritomo ◽  
H. Kuwahara ◽  
Y. Tomioka ◽  
Y. Tokura
Keyword(s):  
Charge Ordering ◽  
Pressure Effects ◽  
Perovskite Manganites ◽  
Ordering Transitions

Effect of Cr Substitution on the Crystal and Magnetic Structure of (Pr0.55Ca0.45)MnO3

2006 ◽  
Vol 52 ◽  
pp. 93-97
Author(s):  
A. Martinelli ◽  
M. Ferretti ◽  
Carlo Castellano ◽  
M.R. Cimberle ◽  
M. Tropeano ◽  
...  
Keyword(s):  
Phase Transition ◽  
Monoclinic Phase ◽  
Magnetic Measurements ◽  
Double Exchange ◽  
Charge Ordering ◽  
Orbital Ordering ◽  
Magnetic Structures ◽  
Spin Ordering ◽  
Cr Substitution ◽  
Lower Temperature

The crystal and magnetic structures of (Pr0.55Ca0.45)(Mn1-yCry)O3 (y = 0.00, 0.03, 0.06) have been investigated between 5 and 300 K by means of neutron powder diffraction followed by Rietveld refinement and dc magnetic measurements. An orthorhombic-to-monoclinic phase transition occurs on cooling in (Pr0.55Ca0.45)MnO3; at lower temperature charge ordering in the Mn sub-lattice, coupled with orbital ordering, induces an anti-ferromagnetic (AFM) spin ordering within the monoclinic phase. Cr substitution at the Mn site hinders the phase transition, although for the y = 0.03 sample small amounts of the monoclinic phase co-exist at low temperature with the main phase characterized by an orthorhombic structure. In addition Cr favours ferromagnetism (FM) participating to the double exchange mechanism. Cr substitution prevents charge ordering, favouring double exchange and hence FM spin ordering within the Mn sub-lattice. The Curie temperature of the Cr substituted samples is independent on the Cr content.

scholarly journals Structural and Magnetic Properties of Nanosized Half-Doped Rare-Earth Ho0.5Ca0.5MnO3 Manganite

2022 ◽  
Vol 12 (2) ◽  
pp. 695
Author(s):  
Alessandra Geddo Lehmann ◽  
Giuseppe Muscas ◽  
Maurizio Ferretti ◽  
Emanuela Pusceddu ◽  
Davide Peddis ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Temperature Dependence ◽  
Sol Gel ◽  
Double Exchange ◽  
Exchange Interactions ◽  
Charge Ordering ◽  
Lattice Parameters ◽  
Orthorhombic Symmetry ◽  
Orbital Ordering ◽  
Structural And Magnetic Properties

We investigated the structural and magnetic properties of 20 nm-sized nanoparticles of the half-doped manganite Ho0.5Ca0.5MnO3 prepared by sol-gel approach. Neutron powder diffraction patterns show Pbnm orthorhombic symmetry for 10 K < T < 290 K, with lattice parameters a, b, and c in the relationship c/√2 < a < b, indicating a cooperative Jahn–Teller effect, i.e., orbital ordering OO, from below room temperature. In contrast with the bulk samples, in the interval 250 < T < 300 K, the fingerprint of charge ordering (CO) does not manifest itself in the temperature dependence of lattice parameters. However, there are signs of CO in the temperature dependence of magnetization. Accordingly, below 100 K superlattice magnetic Bragg reflections arise, which are consistent with an antiferromagnetic phase strictly related to the bulk Mn ordering of a charge exchange-type (CE-type), but characterized by an increased fraction of ferromagnetic couplings between manganese species themselves. Our results show that in this narrow band half-doped manganite, size reduction only modifies the balance between the Anderson superexchange and Zener double exchange interactions, without destabilizing an overall very robust antiferromagnetic state.

Charge ordering and magnetoresistance inNd1−xCaxMnO3due to reduced double exchange

1996 ◽  
Vol 54 (5) ◽  
pp. 3007-3010 ◽  
Author(s):  
K. Liu ◽  
X. W. Wu ◽  
K. H. Ahn ◽  
T. Sulchek ◽  
C. L. Chien ◽  
...  
Keyword(s):  
Double Exchange ◽  
Charge Ordering

Probing the underlying charge ordering: Ruthenium-doped Sm1−xSrxMnO3 perovskite manganites

2001 ◽  
Vol 89 (4) ◽  
pp. 2232-2236 ◽  
Author(s):  
A. Maignan ◽  
C. Martin ◽  
M. Hervieu ◽  
B. Raveau ◽  
J. Hejtmanek
Keyword(s):  
Charge Ordering ◽  
Perovskite Manganites
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