Spin Susceptibility of Intercalated Graphite and Doped Polyacetylene

1980 ◽  
Vol 3 ◽  
Author(s):  
James W. Kaufer ◽  
Seiichiro Ikehata
Keyword(s):  
Density Of States ◽  
Fermi Energy ◽  
Low Frequency ◽  
Spin Susceptibility ◽  
Separate Determination ◽  
Intercalated Graphite ◽  
Heavily Doped

ABSTRACTWe have examined the electronic susceptibility of intercalated graphite and doped (CH)x using ESR [1]. The dopant in both cases was AsF5. For metallic intercalated graphite and for heavily doped (CH)x, the low frequency Schumacher-Slichter technique was used to determine the density of states at the Fermi energy. In the case of doped (CH)x, susceptibility measurements as a function of temperature allowed separate determination of the Curie and Pauli contributions.

Magnetic Spin Susceptibility of AsF5-Intercalated Graphite: Determination of the Density of States at the Fermi Energy

1978 ◽  
Vol 41 (20) ◽  
pp. 1417-1421 ◽  
Author(s):  
B. R. Weinberger ◽  
J. Kaufer ◽  
A. J. Heeger ◽  
J. E. Fischer ◽  
M. Moran ◽  
...  
Keyword(s):  
Density Of States ◽  
Fermi Energy ◽  
Spin Susceptibility ◽  
Intercalated Graphite ◽  
Magnetic Spin

The Fermi energy and screening length in n-type GaAs

1982 ◽  
Vol 60 (3) ◽  
pp. 373-378 ◽  
Author(s):  
W. Sritrakool ◽  
H. R. Glyde ◽  
V. Sa-Yakanit
Keyword(s):  
Density Of States ◽  
Fermi Energy ◽  
Impurity Band ◽  
Band Tail ◽  
Screening Length ◽  
Thomas Fermi ◽  
Low Energies ◽  
Heavily Doped

The Fermi energy, EF, and the screening length, Q−1, in heavily doped n-type GaAs are calculated using the impurity band tail density of states derived recently by Sa-yakanit and Glyde. This density of states agrees with Halperin and Lax's result at low energies and can be extended to higher energies. The resulting EF and Q−1 agree well with values computed by Hwang using the Halperin and Lax density plus a somewhat arbitrary extrapolation. Compensation with attractive impurities is also introduced to lower EF and increase its sensitivity to the band tail density of states. However, EF can be lowered only a little without violating the Thomas–Fermi approximation upon which the concept of a screening length is based.

Determination of the density of states in heavily doped regions of silicon solar cells

2001 ◽  
Vol 65 (1-4) ◽  
pp. 105-110 ◽  
Author(s):  
D.H Neuhaus ◽  
P.P Altermatt ◽  
R.P Starrett ◽  
A.G . Aberle
Keyword(s):  
Solar Cells ◽  
Density Of States ◽  
Silicon Solar Cells ◽  
Heavily Doped

Photoluminescence determination of the Fermi energy in heavily doped strained Si1−xGexlayers

1994 ◽  
Vol 64 (15) ◽  
pp. 1953-1955 ◽  
Author(s):  
M. Líbezný ◽  
S. C. Jain ◽  
J. Poortmans ◽  
M. Caymax ◽  
J. Nijs ◽  
...  
Keyword(s):  
Fermi Energy ◽  
Heavily Doped

scholarly journals Cooper Pairs Distribution function for bcc Niobium under pressure from first-principles

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
G. I. González-Pedreros ◽  
J. A. Camargo-Martínez ◽  
F. Mesa
Keyword(s):  
Distribution Function ◽  
Density Of States ◽  
First Principles ◽  
Low Frequency ◽  
Cooper Pairs ◽  
Phonon Density ◽  
Phonon Density Of States ◽  
Low Frequency Vibration ◽  
Eliashberg Spectral Function

AbstractIn this paper, we report Cooper Pairs Distribution function $${D}_{cp}(\omega ,{T}_{c})$$ D cp ( ω , T c ) for bcc Niobium under pressure. This function reveals information about the superconductor state through the determination of the spectral regions for Cooper-pairs formation. $${D}_{cp}(\omega ,{T}_{c})$$ D cp ( ω , T c ) is built from the well-established Eliashberg spectral function and phonon density of states, calculated by first-principles. $${D}_{cp}(\omega ,{T}_{c})$$ D cp ( ω , T c ) for Nb suggests that the low-frequency vibration region $$\left(\omega <6 \,{\text{meV}}\right)$$ ω < 6 meV is where Cooper-pairs are possible. From $${D}_{cp}(\omega ,{T}_{c})$$ D cp ( ω , T c ) , it is possible to obtain the $${N}_{cp}$$ N cp parameter, which is proportional to the total number of Cooper-Pairs formed at a temperature $${T}_{c}$$ T c . The $${N}_{cp}$$ N cp parameter allows an approach to the understanding of the Nb $${T}_{c}$$ T c anomalies, measured around 5 and 50 GPa.

Magnetic Permeability and Relaxation Frequency in High Frequency Magnetic Materials.

2001 ◽  
Vol 674 ◽  
Author(s):  
M.I. Rosales ◽  
H. Montiel ◽  
R. Valenzuela
Keyword(s):  
High Frequency ◽  
Domain Walls ◽  
Magnetocrystalline Anisotropy ◽  
Low Frequency ◽  
Frequency Dispersion ◽  
Anisotropy Constant ◽  
Relaxation Frequency ◽  
Resonance Relaxation ◽  
Frequency Behavior

ABSTRACTAn investigation of the frequency behavior of polycrystalline ferrites is presented. It is shown that the low frequency dispersion (f < 10 MHz) of permeability is associated with the bulging of pinned domain walls, and has a mixed resonance-relaxation character, closer to the latter. It is also shown that there is a linear relationship between the magnetocrystalline anisotropy constant, K1, and the relaxation frequency. The slope of this correlation depends on the grain size. Such a relationship could allow the determination of this basic parameter from polycrystalline samples.

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