EELS and stopping-power calculation of the superconductor Bi1.8Pb0.3Sr2Ca2Cu3O10

1993 ◽  
Vol 51 ◽  
pp. 1188-1189
Author(s):  
J. R. Dunlap ◽  
S. Luo ◽  
D. C. Joy ◽  
D. C. Chakoumakos ◽  
S. Zhu ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Energy Loss ◽  
Electron Energy ◽  
Room Temperature ◽  
High Temperature Superconductors ◽  
Mean Free Path ◽  
Stopping Power ◽  
Power Calculation ◽  
Individual Crystal ◽  
Electron Energy Loss

Several studies have been undertaken to investigate the fine structure and superconductive properties of high temperature superconductors. Yuan et al. utilized electron energy loss spectroscopy (EELS) to determine the dielectric function of the superconductor Ba2YCu3O7-x. In this study we performed EELS on the superconductor Bi1.8Pb0.3Sr2Ca2Cu3O10 at both room temperature and below the transition temperature and calculated such properties as the dielectric fuction, the inelastic mean free path and the stopping power for this material.Powdered Bi1.8Pb0.3Sr2Ca2Cu3O10 was dispersed by sonication in a 0.2% (wt/v) solution of poly-(N-vinylpyrrolidone) in isoproponal. Individual crystals were allowed to settle and dry on a lacey cabon film. Figure 1 shows a typical individual crystal and Fig.2 shows a typical diffraction pattern. Electron energy loss spectra were recorded from single crystals which extended into holes in the film. The EEL spectra were recorded at room temperature and at 95°K which is below the transition temperature of 105 °K.

Stopping-power determination for compound by EELS

1994 ◽  
Vol 52 ◽  
pp. 948-949 ◽  
Author(s):  
David C. Joy ◽  
Suichu Luo ◽  
John R. Dunlap ◽  
Dick Williams ◽  
Siqi Cao
Keyword(s):  
Energy Loss ◽  
Electron Energy ◽  
Electron Energy Loss Spectroscopy ◽  
Materials Science ◽  
Average Energy ◽  
Stopping Power ◽  
Accurate Information ◽  
Power Calculation ◽  
Coulomb Collisions ◽  
Electron Energy Loss

In Physics, Chemistry, Materials Science, Biology and Medicine, it is very important to have accurate information about the stopping power of various media for electrons, that is the average energy loss per unit pathlength due to inelastic Coulomb collisions with atomic electrons of the specimen along their trajectories. Techniques such as photoemission spectroscopy, Auger electron spectroscopy, and electron energy loss spectroscopy have been used in the measurements of electron-solid interaction. In this paper we present a comprehensive technique which combines experimental and theoretical work to determine the electron stopping power for various materials by electron energy loss spectroscopy (EELS ). As an example, we measured stopping power for Si, C, and their compound SiC. The method, results and discussion are described briefly as below.The stopping power calculation is based on the modified Bethe formula at low energy:where Neff and Ieff are the effective values of the mean ionization potential, and the number of electrons participating in the process respectively. Neff and Ieff can be obtained from the sum rule relations as we discussed before3 using the energy loss function Im(−1/ε).

Comparison of Calculated and Recorded Electron Energy-Loss Spectra of Aluminium and Carbon

1990 ◽  
Vol 48 (2) ◽  
pp. 64-65
Author(s):  
L. Reimer ◽  
R. Oelgeklaus
Keyword(s):  
Fourier Transform ◽  
Energy Loss ◽  
Electron Energy ◽  
Rotational Symmetry ◽  
Mean Free Path ◽  
Single Scattering ◽  
Specimen Thickness ◽  
Two Dimensional ◽  
Image Position ◽  
Electron Energy Loss

Quantitative electron energy-loss spectroscopy (EELS) needs a correction for the limited collection aperture α and a deconvolution of recorded spectra for eliminating the influence of multiple inelastic scattering. Reversely, it is of interest to calculate the influence of multiple scattering on EELS. The distribution f(w,θ,z) of scattered electrons as a function of energy loss w, scattering angle θ and reduced specimen thickness z=t/Λ (Λ=total mean-free-path) can either be recorded by angular-resolved EELS or calculated by a convolution of a normalized single-scattering function ϕ(w,θ). For rotational symmetry in angle (amorphous or polycrystalline specimens) this can be realised by the following sequence of operations :(1)where the two-dimensional distribution in angle is reduced to a one-dimensional function by a projection P, T is a two-dimensional Fourier transform in angle θ and energy loss w and the exponent -1 indicates a deprojection and inverse Fourier transform, respectively.

Electron energy-loss studies on high-temperature superconductors

1989 ◽  
Vol 162-164 ◽  
pp. 1415-1418 ◽  
Author(s):  
J. Fink ◽  
N. Nücker ◽  
H. Romberg ◽  
M. Alexander ◽  
S. Nakai ◽  
...  
Keyword(s):  
High Temperature ◽  
Energy Loss ◽  
Electron Energy ◽  
High Temperature Superconductors ◽  
Electron Energy Loss

Annealing-induced lattice recovery in room-temperature xenon irradiated CeO2: X-ray diffraction and electron energy loss spectroscopy experiments

2015 ◽  
Vol 30 (9) ◽  
pp. 1555-1562 ◽  
Author(s):  
Janne Pakarinen ◽  
Lingfeng He ◽  
Abdel-Rahman Hassan ◽  
Yongqiang Wang ◽  
Mahima Gupta ◽  
...  
Keyword(s):  
Energy Loss ◽  
Electron Energy ◽  
Electron Energy Loss Spectroscopy ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Image Position ◽  
Electron Energy Loss

Abstract

Sign in / Sign up

Export Citation Format

Share Document