scholarly journals A Simple Derivation of the Bloch Equations for Localized Moment E.S.R. in Metals in the Presence of Anisotropy

1973 ◽  
Vol 26 (4) ◽  
pp. 475 ◽  
Author(s):  
DA Smith
Keyword(s):  
Electron Spin Resonance ◽  
Density Matrix ◽  
Matrix Approach ◽  
Many Body ◽  
Bloch Equations ◽  
Simple Derivation ◽  
Local Moments ◽  
Conduction Electrons ◽  
Spin Resonance ◽  
Body Techniques

A density-matrix approach is used to derive the coupled Bloch equations for the electron spin resonance of localized moments and conduction electrons in metals, including anisotropy fields acting on the local moments. The equations agree with those obtained elsewhere by more sophisticated many-body techniques. In particular, it is demonstrated explicitly that relaxation proceeds towards instantaneous equilibrium.

scholarly journals The Effect of Lattice Discreteness on the Linewidth of the Electron Spin Resonance of Local Moments in Metals

1983 ◽  
Vol 36 (4) ◽  
pp. 501 ◽  
Author(s):  
AM Stewart
Keyword(s):  
Electron Spin Resonance ◽  
Curie Temperature ◽  
Electron Spin ◽  
Bloch Equations ◽  
Local Moments ◽  
Paramagnetic Curie Temperature ◽  
Alternative Derivation ◽  
Resonance Linewidth ◽  
Spin Resonance ◽  
Discrete Nature

Solutions of the Hasegawa-Bloch equations for the electron spin resonance of local moments in metals are obtained which take account of the discrete nature of the lattice. The most notable result derived is that the resonance linewidth is proportional to T - () for any degree of bottlenecking, where () is the paramagnetic Curie temperature calculated with lattice discreteness. An alternative derivation of the appropriate Hasegawa-Bloch equations is also given.

Applications of ESR to Carbonaceous Materials

1982 ◽  
Vol 36 (1) ◽  
pp. 52-57 ◽  
Author(s):  
L. S. Singer ◽  
I. C. Lewis
Keyword(s):  
Free Radicals ◽  
Electron Spin Resonance ◽  
Low Temperature ◽  
Electron Spin ◽  
Paramagnetic Species ◽  
Carbonaceous Materials ◽  
Conduction Electrons ◽  
Spin Resonance ◽  
Higher Temperature ◽  
Low Temperature Pyrolysis

The applications of electron spin resonance (ESR) to carbonaceous materials are reviewed. The stable paramagnetic species observed in the products of low-temperature pyrolysis are odd-alternate neutral free radicals, whereas the unpaired spins of higher temperature carbons and graphites are primarily conduction electrons. The variety of ESR properties and phenomena requires special attention to techniques of measurement and interpretations of results. The relevance to the carbonization process of the free radicals observed by ESR is also discussed.

Low temperature frequency dependence of the electron spin resonance absorption in heavily phosphorus-doped silicon

1970 ◽  
Vol 48 (24) ◽  
pp. 2930-2936 ◽  
Author(s):  
F. T. Hedgcock ◽  
T. W. Raudorf
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Magnetic Moments ◽  
Charge Carriers ◽  
Mobile Charge ◽  
Local Moments ◽  
Spin Resonance ◽  
Doped Silicon ◽  
Pauli Paramagnetism ◽  
Phosphorus Doped

Electron spin resonance (ESR) measurements have been made on a phosphorus-doped silicon specimen (n = 1.38 × 1019/cc) in the liquid helium temperature range. A single line with a g factor of approximately 2 was observed for resonant magnetic fields of 540, 3230, and 12 590 G at 1517, 9010, and 35 200 MHz respectively. The experimentally determined magnetization is compared with the magnetizations expected from the following sources: (a) un-ionized charge carriers or local magnetic moments obeying a Curie law, (b) mobile carriers experiencing an exchange interaction with local magnetic moments, and (c) mobile charge carriers showing only Pauli paramagnetism. The magnetization derived from the ESR data exhibits a linear dependence with magnetic field and no temperature dependence. This is consistent with the Pauli paramagnetism expected for mobile charge carriers in the absence of any interaction with local moments.

Electron spin-resonance studies of conduction electrons in phosphorus-doped silicon nanocrystals

2007 ◽  
Vol 101 (3) ◽  
pp. 033504 ◽  
Author(s):  
Kazuaki Sumida ◽  
Keiichi Ninomiya ◽  
Minoru Fujii ◽  
Kazuyoshi Fujio ◽  
Shinji Hayashi ◽  
...  
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Silicon Nanocrystals ◽  
Conduction Electrons ◽  
Spin Resonance ◽  
Doped Silicon ◽  
Phosphorus Doped

Identifying the electron spin resonance of conduction electrons in alkali doped SWCNTs

2009 ◽  
Vol 246 (11-12) ◽  
pp. 2760-2763 ◽  
Author(s):  
M. Galambos ◽  
G. Fábián ◽  
F. Simon ◽  
L. Ćirić ◽  
L. Forró ◽  
...  
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Conduction Electrons ◽  
Spin Resonance
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