نتایج جستجو برای: phonon vibrations

تعداد نتایج: 30225  

Journal: :SciPost physics core 2022

We study the dynamics of a one-dimensional Rydberg lattice gas under facilitation (anti-blockade) conditions which implements so-called kinetically constrained spin system. Here an atom can only be excited to state when one its neighbors is already excited. Once two or more atoms are simultaneously mechanical forces emerge, couple internal electronic this many-body system external vibrational d...

سیداحمد کتابی, , ناصر شاه‌طهماسبی, ,

  Using the forced oscillator method (FOM) and the transfer-matrix technique, we numerically investigate the nature of the phonon states and the wave propagation, in the presence of an external force, in the chains composed of Fibonacci lattices of type site, bond and mixing models, as the quasiperiodic systems. Calculating the Lyapunov exponent and the participation ratio, we also study the lo...

Journal: :Journal of Solid State Electrochemistry 2022

Abstract La 1-x A x CoO 3-δ (A = Sr, Ba) nanoparticles used as an inert anode in molten salts were characterized using phonon vibrations, and their compositions morphologies investigated. These for nanostructure fabrication of to reduce oxide ion transportation. The singularity structure changes with increasing Sr content showed a transient spin state change from low-spin intermediate- and/or h...

Journal: :Materials Today Physics 2023

Recently, robustness of superconductivity to external pressure has been observed in high-entropy (HE) metal telluride (MTe). Here, we investigated the atomic displacement parameters (Uiso), vibration characteristics, and electronic structure MTe with various configurational entropies mixing (ΔSmix) at M site understand origin superconductivity. Uiso clearly increased by M-site alloying ΔSmix ≥ ...

Journal: :Physica B-condensed Matter 2021

In this paper, we present the spin-phonon coupling and dielectric response of nano-crystalline Pr$_2$CoMnO$_6$ employing Raman spectroscopic study. is a manganite compound , it undergoes paramagnetic to ferromagnetic (PM-FM) phase transition around $T_c$ $\sim$172 K. Temperature-dependent scattering experiment carried out across study behavior in material. The results from reveal an obvious sof...

Journal: :Physical review 2021

We present a theory and simulation of thermal diffuse scattering due to the excitation magnons in scanning transmission electron microscopy. The calculations indicate that can atomic contrast when detected by energy-loss spectroscopy using atomic-size beams. results presented here intensity magnon bcc iron at 300~K is 4 orders magnitude weaker than arising from vibrations. In an energy range wh...

2003
Beom Jun Kim H Hong M Y Choi

We consider atoms interacting each other through the topological structure of a complex network and investigate lattice vibrations of the system, the quanta of which we call netons for convenience. The density of neton levels, obtained numerically, reveals that unlike a local regular lattice, the system develops a gap of a finite width, manifesting extreme rigidity of the network structure at l...

Ali Najafi Farkhonde Zilabi Hassan Gheisari Dehsheikh

(RETRACTED PAPER) The Publisher and Editor retract this article based on the Publication Ethics In this project,Bio-based carbon nanotubes (CNTs) have received considerable research attention due to their comparative advantages of high level stability, simplistic use, low toxicity and overall environmental friendliness. New potentials for improvement in heat transfer applications are presented ...

2016
K. V. Shanavas L. Lindsay D. S. Parker

Calculations using first principles methods and strong coupling theory are carried out to understand the electronic structure and superconductivity in cubic and tetragonal TiH2. A large electronic density of states at the Fermi level in the cubic phase arises from Ti-t2g states and leads to a structural instability towards tetragonal distortion at low temperatures. However, constraining the in-...

2008
Alessio Gagliardi Giuseppe Romano Alessandro Pecchia Aldo Di Carlo Thomas Frauenheim Thomas A Niehaus

In this paper, we investigate dissipation in molecular electronic devices. Dissipation is a crucial quantity which determines the stability and heating of the junction. Moreover, several experimental techniques which use inelastically scattered electrons as probes to investigate the geometry in the junction are becoming fundamental in the field. In order to describe such physical effects, a non...

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