Three-dimensional magnetic interactions inNaxCoO2: First-principles calculations and analysis of exchange mechanisms

2005 ◽  
Vol 71 (21) ◽  
Author(s):  
M. D. Johannes ◽  
I. I. Mazin ◽  
D. J. Singh
Keyword(s):  
First Principles ◽  
Three Dimensional ◽  
Magnetic Interactions ◽  
First Principles Calculations

scholarly journals Preferential proton conduction along a three-dimensional dopant network in yttrium-doped barium zirconate: a first-principles study

2018 ◽  
Vol 6 (45) ◽  
pp. 22721-22730 ◽  
Author(s):  
Kazuaki Toyoura ◽  
Weijie Meng ◽  
Donglin Han ◽  
Tetsuya Uda
Keyword(s):  
First Principles ◽  
Three Dimensional ◽  
Proton Conduction ◽  
Atomic Scale ◽  
Barium Zirconate ◽  
First Principles Calculations ◽  
First Principles Study

The atomic-scale picture of proton conduction in highly doped barium zirconate has theoretically been clarified using first-principles calculations.

Unusual interfacial magnetic interactions for τ-MnAl with Fe(Co) atomic layers

2019 ◽  
Vol 21 (5) ◽  
pp. 2443-2452 ◽  
Author(s):  
Junwei Tong ◽  
Yuxuan Feng ◽  
Fubo Tian ◽  
Lianqun Zhou ◽  
Gaowu Qin ◽  
...  
Keyword(s):  
First Principles ◽  
Magnetic Interaction ◽  
Magnetic Interactions ◽  
Coupling Mechanism ◽  
First Principles Calculations

The interfacial magnetic interaction and coupling mechanism for τ-MnAl with Fe(Co) atomic layers have been studied using first principles calculations.

Studies of magnetic interactions in Mn-doped β-Ga2O3 from first-principles calculations

2008 ◽  
Vol 58 (11) ◽  
pp. 943-946 ◽  
Author(s):  
Guangqing Pei ◽  
Changtai Xia ◽  
Yongjun Dong ◽  
Bo Wu ◽  
Tao Wang ◽  
...  
Keyword(s):  
First Principles ◽  
Magnetic Interactions ◽  
First Principles Calculations ◽  
Mn Doped

scholarly journals Three-dimensional metallic carbon allotropes with superhardness

2021 ◽  
Vol 10 (1) ◽  
pp. 1266-1276
Author(s):  
Qingyang Fan ◽  
Heng Liu ◽  
Li Jiang ◽  
Wei Zhang ◽  
Yanxing Song ◽  
...  
Keyword(s):  
Fermi Level ◽  
Dynamic Stability ◽  
First Principles ◽  
Mechanical Stability ◽  
Three Dimensional ◽  
First Principles Calculations ◽  
Charge Densities ◽  
Carbon Allotropes

Abstract Three novel three-dimensional orthorhombic carbon phases are proposed based on first-principles calculations in this work. These phases possess dynamic stability and mechanical stability and are theoretically more favorable in energy compared to most other carbon allotropes. The hardness levels of oP-C16, oP-C20, and oP-C24 are 47.5, 49.6, and 55.3 GPa, respectively, which are greater than those of T10, T18, and O12 carbon. In addition, although oP-C16, oP-C20, and oP-C24 are metals, their ideal shear strengths are also greater than those of common metals such as Cu, Fe, and Al. Due to p y electrons crossing the Fermi level, oP-C16, oP-C20, and oP-C24 show metallicity, and their charge densities of the band decomposition suggest that all the conductive directions of oP-C16, oP-C20, and oP-C24 are exhibited along the a- and b-axis, similar to C5.

scholarly journals Structural Evolution, Redox Mechanism, and Ionic Diffusion in Rhombohedral Na2FeFe(CN)6 for Sodium-Ion Batteries: First-Principles Calculations

2022 ◽  
Author(s):  
Ya-Ping Wang ◽  
B. P. Hou ◽  
Xin-Rui Cao ◽  
Shunqing Wu ◽  
Zi-Zhong Zhu
Keyword(s):  
First Principles ◽  
Rational Design ◽  
Low Cost ◽  
Magnetic Moments ◽  
Three Dimensional ◽  
Structural Evolution ◽  
Sodium Ion ◽  
High Rate ◽  
Sodium Ion Batteries ◽  
First Principles Calculations

Abstract Prussian blue analogs (Na2FeFe(CN)6) have been regarded as potential cathode materials for sodium-ion batteries (SIBs) due to their low-cost iron resources and open framework. Herein, the detailed first-principles calculations have been performed to investigate the electrochemical properties of NaxFeFe(CN)6 during Na ion extraction. The material undergoes a phase transition from a dense rhombohedral to open cubic structure upon half-desodiation, which is resulted from competition of the Na−N Coulomb attraction and d−π covalent bonding of Fe−N. The analyses on the density of states, magnetic moments and Bader charges of NaxFeFe(CN)6 reveal that there involve in the successive redox reactions of high-spin Fe2+/Fe3+ and low-spin Fe2+/Fe3+ couples during desodiation. Moreover, the facile three-dimensional diffusion channels for Na+ ions exhibit low diffusion barriers of 0.4 eV ~ 0.44 eV, which ensures a rapid Na+ transport in the NaxFeFe(CN)6 framework, contributing to high rate performance of the battery. This study gives a deeper understanding of the electrochemical mechanisms of NaxFeFe(CN)6 during Na+ extraction, which is beneficial for the rational design of superior PBA cathodes for SIBs.

scholarly journals Magnetically driven short-range order can explain anomalous measurements in CrCoNi

2021 ◽  
Vol 118 (13) ◽  
pp. e2020540118
Author(s):  
Flynn Walsh ◽  
Mark Asta ◽  
Robert O. Ritchie
Keyword(s):  
First Principles ◽  
Short Range ◽  
Short Range Order ◽  
Nearest Neighbor ◽  
Range Order ◽  
Magnetic Interactions ◽  
First Principles Calculations ◽  
Principal Element ◽  
The Impact ◽  
Magnetically Aligned

The presence, nature, and impact of chemical short-range order in the multi-principal element alloy CrCoNi are all topics of current interest and debate. First-principles calculations reveal that its origins are fundamentally magnetic, involving repulsion between like-spin Co–Cr and Cr–Cr pairs that is complemented by the formation of a magnetically aligned sublattice of second-nearest-neighbor Cr atoms. Ordering models following these principles are found to predict otherwise anomalous experimental measurements concerning both magnetization and atomic volumes across a range of compositions. In addition to demonstrating the impact of magnetic interactions and resulting chemical rearrangement, the possible explanation of experiments would imply that short-range order of this type is far more prevalent than previously realized.

scholarly journals Confinement Effect Driven Quantum Spin Hall Effect in Monolayer AuTe2Cl

SPIN ◽  
2019 ◽  
Vol 09 (04) ◽  
pp. 1940014
Author(s):  
Guyue Zhong ◽  
Q. Xie ◽  
Gang Xu
Keyword(s):  
First Principles ◽  
Three Dimensional ◽  
Bulk Sample ◽  
Quantum Spin ◽  
Confinement Effect ◽  
First Principles Calculations ◽  
Quantum Spin Hall Effect ◽  
Band Inversion ◽  
Topological Semimetal ◽  
Quantum Spin Hall

Based on first-principles calculations, we predict that the monolayer AuTe2Cl is a quantum spin Hall (QSH) insulator with a topological band gap about 10 meV. The three-dimensional (3D) AuTe2Cl is a topological semimetal that can be viewed as the monolayer stacking along [Formula: see text] axis. By studying the energy-level distribution of [Formula: see text] orbitals of Te atoms for the bulk and the monolayer, we find that the confinement effect driven [Formula: see text] band inversion is responsible for the topological nontrivial nature of monolayer. Since 3D bulk AuTe2Cl has already been experimentally synthesized, we expect that monolayer AuTe2Cl can be exfoliated from a bulk sample and the predicted QSH effect can be observed.

Electronic structure and magnetic interactions in Ni-doped β-Ga2O3 from first-principles calculations

2009 ◽  
Vol 61 (5) ◽  
pp. 477-480 ◽  
Author(s):  
Wen-Zhi Xiao ◽  
Ling-Ling Wang ◽  
Liang Xu ◽  
Qing Wan ◽  
B.S. Zou
Keyword(s):  
Electronic Structure ◽  
First Principles ◽  
Magnetic Interactions ◽  
First Principles Calculations
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