نتایج جستجو برای: rvb

تعداد نتایج: 166  

ژورنال: :پژوهش فیزیک ایران 0
محمدرضا محمدی زاده m. r. mohammadizadeh and m akhavan magnetic research lab. (mrl) department of physics, sharif university of technologyآزمایشگاه تحقیقاتی مغناطیس ، دانشکده فیزیک، دانشگاه صنعتی شریف محمد اخوان m akhavan magnetic research lab. (mrl) department of physics, sharif university of technologyآزمایشگاه تحقیقاتی مغناطیس ، دانشکده فیزیک، دانشگاه صنعتی شریف

به منظور مطالعه خواص ساختاری، الکترونی و دینامیک شار، نمونههای تک فاز و چند بلوری 0.00 ≤ x ≤ 1.00  gd(ba2-xprx)cu3o با  ساخته و مورد ارزیابی قرار گرفتند. نحوه تغییرات پارامترهای شبکه و حجم سلول واحد برحسب آلایش x) pr )، مقدار اکسیژن بیشتر از 7، مشاهده حد حل پذیری و بروزگذار اورتورومبیک – تتراگونال برحسب x و عدم مشاهده هرگونه فاز ناخالصی بر پایه gd همگی حاکی از حضور اتم pr در مکان ba است. چنین ا...

2008
Shi-Dong Liang T. K. Lee

The magnetic polarization induced by nonmagnetic impurities such as Zn in high Tc cuprate compounds is studied by the variational Monte Carlo simulation. The variational wave function is constructed from the eigenstates obtained from Bogoliubov de Gennes mean field Hamiltonian for the twodimensional t − J model. A Jastrow factor is introduced to account for the induced magnetic moment and the r...

Journal: :Chem 2021

To achieve single-component organic conductors with metallic conductivity has been one of the most exciting goal in field conductors. Generally, materials are electrical insulators because electrons paired, and band gap between HOMO LUMO is large. Besides, lack efficient molecular orbital overlap may lead to a small bandwidth materials. Organic radicals can extremely low large by chemical modul...

1997
Naoto Nagaosa Patrick A. Lee

We study the Kondo effect due to the nonmagnetic impurity, e.g., Zn, in high-Tc cuprates based on the spin-change separated state. In the optimal or overdoped case with the Kondo screening, the residual resistivity is dominated by the spinons while the T-dependent part determined by the holons. This gives ρ(T ) = 4h̄ e2 nimp. 1−x + αT x (x: hole concentration,nimp.: impurity concentration, α: co...

Journal: :Photogrammetric Record 2022

The problem of brightness differences between images the same scene is important to field unmanned aerial vehicle (UAV) photogrammetry and affects both aesthetics interpretation final product. This can be caused by changes in positions camera or sun, as well weather conditions. article deals with varied image latter. Relative radiometric normalisation (RRN) acquired RGB imagery used diminish ef...

Journal: :Organization Science 2002
Ramiro Montealegre

Past literature using the resource-based view of the firm has concentrated on attributes of firms' capabilities and on strategies for exploiting existing firm-specific assets. Comparatively little research has been conducted on how a firm develops, manages, and deploys capabilities to support its business strategy. This study seeks to understand the process of capability development and to esta...

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