Related Experiment Video
Updated: Aug 12, 2026
08:49
Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films
Published on: December 4, 2014
Two-dimensional charge order in layered 2-1-4 perovskite oxides
Shigeki Onoda1, Yukitoshi Motome, Naoto Nagaosa
1Tokura Spin SuperStructure Project, ERATO, Japan Science and Technology Corporation, Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Physical Review Letters
|July 13, 2004
Summary
Monte Carlo simulations reveal that layered perovskites exhibit 2D charge ordering due to interlayer frustration. Monoclinic distortion induces 3D ordering, influencing critical exponents in these complex materials.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Layered perovskite oxides exhibit complex charge ordering phenomena.
- Interlayer interactions and structural distortions play crucial roles in determining charge ordering dimensionality.
Purpose of the Study:
- To investigate the emergence of charge ordering in a minimal model of 2-1-4 layered perovskites using Monte Carlo simulations.
- To understand the influence of interlayer coupling and structural distortions on the dimensionality and critical behavior of charge ordering.
Main Methods:
- Three-dimensional (3D) Ising model simulations with a 2-1-4 layered perovskite structure.
- Analysis of critical exponents as a function of interlayer coupling.
- Investigation of the role of interlayer Coulomb interactions and monoclinic distortion.
Main Results:
- Simulations show emergent 2D long-range order due to interlayer frustration, with finite correlation along the c-axis.
- Critical exponents vary continuously with the interlayer coupling constant.
- Monoclinic distortion is identified as the key mechanism inducing 3D charge ordering by lifting degeneracy.
Conclusions:
- The study clarifies the mechanisms driving 3D charge ordering in layered perovskites, highlighting the importance of structural distortions over long-range Coulomb interactions.
- The findings provide insights into the charge ordering dimensionality in materials like La0.5Sr1.5MnO4.
Related Concept Videos
02:42Formal Charges
In some cases, there are seemingly more than one valid Lewis structures for molecules and polyatomic ions. The concept of formal charges can be used to help predict the most appropriate Lewis structure when more than one reasonable structure exists.
02:42Ionic Crystal Structures
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
02:37Metallic Solids
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
02:42Valence Bond Theory
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
01:30The Electrical Double Layer
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...