Temperature dependent optical properties of Mn doped (Pb,Sr)TiO3 ferroelectric films in absorption region: Electron–phonon interaction

2010 ◽  
Vol 108 (11) ◽  
pp. 114102 ◽  
Author(s):  
J. Yang ◽  
Y. Q. Gao ◽  
J. Wu ◽  
Z. M. Huang ◽  
X. J. Meng ◽  
...  
Keyword(s):  
Optical Properties ◽  
Temperature Dependent ◽  
Ferroelectric Films ◽  
Phonon Interaction ◽  
Absorption Region ◽  
Electron Phonon Interaction ◽  
Mn Doped

scholarly journals Temperature Dependence of G and D’ Phonons in Monolayer to Few-Layer Graphene with Vacancies

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Mingming Yang ◽  
Longlong Wang ◽  
Xiaofen Qiao ◽  
Yi Liu ◽  
Yufan Liu ◽  
...  
Keyword(s):  
Negative Temperature Coefficient ◽  
Negative Temperature ◽  
Intrinsic Properties ◽  
Temperature Dependent ◽  
Phonon Interaction ◽  
Electron Phonon Interaction ◽  
Layer Graphene ◽  
A Value ◽  
Few Layer Graphene

Abstract The defects into the hexagonal network of a sp2-hybridized carbon atom have been demonstrated to have a significant influence on intrinsic properties of graphene systems. In this paper, we presented a study of temperature-dependent Raman spectra of G peak and D’ band at low temperatures from 78 to 318 K in defective monolayer to few-layer graphene induced by ion C+ bombardment under the determination of vacancy uniformity. Defects lead to the increase of the negative temperature coefficient of G peak, with a value almost identical to that of D’ band. However, the variation of frequency and linewidth of G peak with layer number is contrary to D’ band. It derives from the related electron-phonon interaction in G and D’ phonon in the disorder-induced Raman scattering process. Our results are helpful to understand the mechanism of temperature-dependent phonons in graphene-based materials and provide valuable information on thermal properties of defects for the application of graphene-based devices.

Temperature-dependent dielectric loss in BaTiO3: Competition between tunnelling probability and electron-phonon interaction

2021 ◽  
Vol 257 ◽  
pp. 123792
Author(s):  
Aanchal Sati ◽  
Anil Kumar ◽  
Vikash Mishra ◽  
Kamal Warshi ◽  
Preeti Pokhriyal ◽  
...  
Keyword(s):  
Dielectric Loss ◽  
Temperature Dependent ◽  
Phonon Interaction ◽  
Electron Phonon Interaction
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