Results 11 to 20 of about 134,957 (331)

Spin and orbital valence bond solids in a one-dimensional spin-orbital system: Schwinger boson mean-field theory [PDF]

open access: green, 2005
A generalized one-dimensional $SU(2)\times SU(2)$ spin-orbital model is studied by Schwinger boson mean-field theory (SBMFT). We explore mainly the dimer phases and clarify how to capture properly the low temperature properties of such a system by SBMFT.
Peng Li, Shun-Qing Shen
openalex   +4 more sources

Theory of Gossamer and resonating valence bond superconductivity [PDF]

open access: bronze, 2005
We use an effective Hamiltonian for two-dimensional Hubbard model including an antiferromagnetic spin-spin coupling term to study recently proposed gossamer superconductivity.
J. Y. Gan, Fu‐Chun Zhang, Zhixun Su
openalex   +5 more sources

Theory of Valence-Bond Lattice on Spin Lattice [PDF]

open access: green, 1994
Quantum spin-lattice systems in low dimensions exhibit a variety of interesting zero-temperature phases, some of which show non-classical (i.e., non-magnetic) long-range orders, such as dimer or trimer valence-bond order.
Yang Xian
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Valence-bond theory of highly disordered quantum antiferromagnets [PDF]

open access: gold, 2009
We present a large-N variational approach to describe the magnetism of insulating doped semiconductors based on a disorder-generalization of the resonating-valence-bond theory for quantum antiferromagnets.
Sen Zhou   +3 more
openalex   +5 more sources

Bond, vibration and microwave dielectric characteristics of Zn1-x(Li0.5Bi0.5)xWO4 ceramics with low temperature sintering

open access: yesJournal of Materiomics, 2022
The bond, vibration and microwave dielectric characteristics of Zn1-x (Li0.5Bi0.5)xWO4 (x = 0–0.12) ceramics were investigated by XRD refinement, Raman and FT-IR spectroscopy and complex bond valence theory. The results showed that proper substitution of
Qin Zhang   +3 more
doaj   +1 more source

The location of the chemical bond. Application of long covalent bond theory to the structure of silica

open access: yesFrontiers in Chemistry, 2023
Oxygen is the most abundant terrestrial element and is found in a variety of materials, but still wanting is a universal theory for the stability and structural organization it confers.
Stephen A. Miller
doaj   +1 more source

Analysis of chemical structure and characteristics of building materials based on element chemistry [PDF]

open access: yesE3S Web of Conferences, 2021
Elements in accordance with a certain proportion and spatial arrangement constitute the microstructure of the building materials, which lead to a specific property and function in the macro.
Yanlong Zhao   +3 more
doaj   +1 more source

Interplane charge dynamics in a valence-bond dynamical mean-field theory of cuprate superconductors [PDF]

open access: green, 2010
We present calculations of the interplane charge dynamics in the normal state of cuprate superconductors within the valence-bond dynamical mean-field theory.
Michel Ferrero   +4 more
openalex   +5 more sources

A Valence-Bond-Based Multiconfigurational Density Functional Theory: The λ-DFVB Method Revisited

open access: yesMolecules, 2021
A recently developed valence-bond-based multireference density functional theory, named λ-DFVB, is revisited in this paper. λ-DFVB remedies the double-counting error of electron correlation by decomposing the electron–electron interactions into the wave ...
Peikun Zheng   +4 more
doaj   +1 more source

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