scholarly journals Observation of orbital ordering and Jahn-Teller distortions supporting the Wigner-crystal model in highly dopedBi1−xCaxMnO3

2007 ◽  
Vol 75 (8) ◽  
Author(s):  
S. Grenier ◽  
V. Kiryukhin ◽  
S-W. Cheong ◽  
B. G. Kim ◽  
J. P. Hill ◽  
...  
Keyword(s):  
Wigner Crystal ◽  
Orbital Ordering ◽  
Crystal Model ◽  
Jahn Teller

Effects of Non-Magnetic Doping upon Orbital and Magnetic Structures of Lanthanum Manganite

2012 ◽  
Vol 190 ◽  
pp. 671-674
Author(s):  
Liudmila E. Gonchar ◽  
Anton A. Firsin ◽  
Anatoliy E. Nikiforov ◽  
Sergey E. Popov
Keyword(s):  
Crystal Structure ◽  
Lanthanum Manganite ◽  
Orbital Ordering ◽  
Orbital State ◽  
Magnetic Structures ◽  
Ferromagnetic Exchange ◽  
Crystal Model ◽  
Jahn Teller ◽  
Jahn Teller Effect ◽  
Exchange Parameters

The theoretical model of the crystal structure of lanthanum manganite doped by non-Jahn-Teller ions is proposed. In order to describe the changes in the crystal structure and orbital state of manganese ions subsystem, we use modified shell model and virtual crystal model. The orbital ordering collapse is explained in terms of dynamical Jahn-Teller effect. The model of superexchange interaction helps to find the values of antiferromagnetic and ferromagnetic exchange parameters for dynamical and static orbital states of interacting ions. The magnetic structure of LaMn1-xGaxO3 is explained and magnetic resonance spectrum is predicted.

Jahn-Teller stabilization of magnetic and orbital ordering in rocksalt CuO

2009 ◽  
Vol 80 (14) ◽  
Author(s):  
Giovanni Peralta ◽  
Danilo Puggioni ◽  
Alessio Filippetti ◽  
Vincenzo Fiorentini
Keyword(s):  
Orbital Ordering ◽  
Jahn Teller

Wigner crystal model for the radical ions of tetracyanoquinodimethane salts

1978 ◽  
Vol 13 (5) ◽  
pp. 460-466
Author(s):  
V. E. Klimenko ◽  
V. Ya. Krivnov ◽  
A. A. Ovchinnikov ◽  
I. I. Ukrainskii
Keyword(s):  
Wigner Crystal ◽  
Radical Ions ◽  
Crystal Model

Wigner crystal model for quasi-one-dimensional systems based on TCNQ

1977 ◽  
Vol 24 (10) ◽  
pp. iv
Author(s):  
V.E. Klymenko ◽  
A.A. Ovchinnikov ◽  
I.I. Ukrainskii ◽  
V.Ya. Krivnov ◽  
L.Ya. Karpov
Keyword(s):  
Wigner Crystal ◽  
One Dimensional ◽  
Crystal Model

scholarly journals Структурные механизмы и термодинамическое описание изосимметрийного орбитального упорядочения в редкоземельных манганитах

2019 ◽  
Vol 61 (11) ◽  
pp. 2056
Author(s):  
М.П. Ивлиев ◽  
В.П. Сахненко
Keyword(s):  
Phase Transition ◽  
Order Parameter ◽  
Phenomenological Theory ◽  
Internal Field ◽  
Orbital Ordering ◽  
Entire Series ◽  
Cubic Lattice ◽  
Orbital Phase ◽  
Jahn Teller ◽  
Jahn Teller Effect

It is shown that the observed features of the orbital phase transition in AMnO3 perovskites (A = La, Pr, ..., Lu) are due to the occurrence of rotational distortions of a cubic lattice at high temperatures, causing anion displacements that create an “internal field” which, by symmetry, coincides with the order parameter describing the ordering of octahedra distorted due to the Jahn-Teller effect (orbital ordering). The influence of this “field” essentially determines the type of orbital ordering, its temperature and the nature of the phase transition. A comparative analysis of orbitally ordered states was carried out for the entire series of AMnO3, both in the framework of the phenomenological theory of phase transitions and on the basis of the three-minimum multi-lattice model proposed in the article. The specific features of the magnetic transitions in manganites, due to the specific features of the structure, are discussed.

CBED Study of Mn3+ Orbital Ordering in LaMnO3

2000 ◽  
Vol 6 (S2) ◽  
pp. 46-47
Author(s):  
B. Jiang ◽  
J.M. Zuo ◽  
Q. Chen ◽  
S-W Cheong ◽  
J.C.H. Spence
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Parent Compound ◽  
Electronic Configuration ◽  
Antiferromagnetic State ◽  
Orbital Ordering ◽  
The Family ◽  
Jahn Teller ◽  
Octahedral Tilting ◽  
Mn Oxides

Mn oxides of pervoskite-related structure containing Mn ions have attracted considerable interest due to the colossal magnetoresistence (CMR) effect. Doping the family of compounds La1-x Cax MnO3 with divalent Ca ion oxidizes Mn+3 to Mn4+, introducing holes in the 3d bond orbital that give rise to a series of interesting physical properties. The parent compound LaMnO3 (Pbnm) with unit cell of a=5.5367Å b=5.7473Å and c=7.6929Å, is an antiferromagnetic insulator in which orbital ordering is established due to the cooperative Jahn-Teller (JT) effect breaking the degeneracy of the electronic configuration of Mn3+ (t2g3eg1). This particular C-type orbital ordering is responsible for the A-type magnetic structure observed by Wollen and Kohler. Theoretical Monte-Carlo simulation has shown that the A-type antiferromagnetic state is stable in a model based on JT phonons, using coupling values physically reasonable for LaMnO3 and considering the small but important effect of octahedral tilting.

scholarly journals Electric-Field Control of Magnetization, Jahn-Teller Distortion, and Orbital Ordering in Ferroelectric Ferromagnets

2019 ◽  
Vol 122 (24) ◽  
Author(s):  
Lan Chen ◽  
Changsong Xu ◽  
Hao Tian ◽  
Hongjun Xiang ◽  
Jorge Íñiguez ◽  
...  
Keyword(s):  
Electric Field ◽  
Orbital Ordering ◽  
Teller Distortion ◽  
Field Control ◽  
Jahn Teller ◽  
Jahn Teller Distortion
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