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

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

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

scholarly journals Local Jahn-Teller distortions and orbital ordering inBa3Cu1+xSb2−xO9investigated by neutron scattering

2016 ◽  
Vol 93 (1) ◽  
Author(s):  
Bing Li ◽  
Despina Louca ◽  
Mikhail Feygenson ◽  
Craig M. Brown ◽  
John R. D. Copley ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Orbital Ordering ◽  
Jahn Teller

THE ORBITAL ORDERING OF THE CUBIC KCrF3

2012 ◽  
Vol 26 (04) ◽  
pp. 1150025 ◽  
Author(s):  
MINPING ZHANG ◽  
GUANGTAO WANG
Keyword(s):  
Electron Correlation ◽  
First Principles ◽  
Theoretical Calculations ◽  
Cubic Phase ◽  
Orbital Ordering ◽  
Teller Distortion ◽  
Jahn Teller ◽  
Jahn Teller Distortion ◽  
First Principles Method

The electronic, magnetic and orbital structures of KCrF 3 in the cubic phase are studied by first principles method. In the cubic phase, the three Cr - F bonds distance are equal. If the Jahn–Teller distortion is the origin of the orbital polarization, the orbital ordering would disappear. However, our theoretical calculations show that the orbital ordering exists even without the Jahn–Teller distortion. By studying how the orbital polarization changes with the electron correlation and the Jahn–Teller distortion, we found that the origin of the orbital polarization should be the electron correlation and the Jahn–Teller distortion can reinforced such polarization.

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