scholarly journals Charge-orbital ordering and phase separation in the two-orbital model for manganites: Roles of Jahn-Teller phononic and Coulombic interactions

2000 ◽  
Vol 62 (14) ◽  
pp. 9432-9452 ◽  
Author(s):  
Takashi Hotta ◽  
Andre Luiz Malvezzi ◽  
Elbio Dagotto
Keyword(s):  
Phase Separation ◽  
Orbital Ordering ◽  
Coulombic Interactions ◽  
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

Phase separation, orbital ordering and magnetism in (La0.375Ca0.625)MnO3

2016 ◽  
Vol 239 ◽  
pp. 99-105 ◽  
Author(s):  
A. Martinelli ◽  
M. Ferretti ◽  
C. Ritter
Keyword(s):  
Phase Separation ◽  
Orbital Ordering

scholarly journals Charge disproportionation and nano phase separation in $$\textit{R}\mathrm{SrNiO}_{4}$$

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
H. Guo ◽  
Z. W. Li ◽  
C. F. Chang ◽  
Z. Hu ◽  
C.-Y. Kuo ◽  
...  
Keyword(s):  
Phase Separation ◽  
Phonon Dispersion ◽  
Excitation Spectra ◽  
Teller Distortion ◽  
Charge Disproportionation ◽  
Spin Excitations ◽  
Bond Stretching ◽  
Jahn Teller ◽  
Magnetic Excitation Spectra ◽  
Jahn Teller Distortion

Abstract We have successfully grown centimeter-sized layered $$\textit{R}\mathrm{SrNiO}_{4}$$ R SrNiO 4 single crystals under high oxygen pressures of 120–150 bar by the floating zone technique. This enabled us to perform neutron scattering experiments where we observe close to quarter-integer magnetic peaks below $$\sim 77~\mathrm{K}$$ ∼ 77 K that are accompanied by steep upwards dispersing spin excitations. Within the high-frequency Ni–O bond stretching phonon dispersion, a softening at the propagation vector for a checkerboard modulation can be observed. We were able to simulate the magnetic excitation spectra using a model that includes two essential ingredients, namely checkerboard charge disproportionation and nano phase separation. The results thus suggest that charge disproportionation is preferred instead of a Jahn–Teller distortion even for this layered $$\mathrm{Ni}^{3+}$$ Ni 3 + system.

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 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.

Sign in / Sign up

Export Citation Format

Share Document