Dynamic spin relaxation processes of μ+ in an antiferromagnet

1994 ◽  
Vol 85 (1) ◽  
pp. 281-286 ◽  
Author(s):  
A. Keren
Keyword(s):  
Spin Relaxation ◽  
Relaxation Processes ◽  
Dynamic Spin

Proton Spin Relaxation of a Liquid Crystal with a Glassy Cholesteric State

1990 ◽  
Vol 45 (9-10) ◽  
pp. 1077-1084 ◽  
Author(s):  
D. Pusiol ◽  
F. Noack ◽  
C. Aguilera
Keyword(s):  
Spin Relaxation ◽  
Rotational Diffusion ◽  
Glassy State ◽  
Larmor Frequency ◽  
Proton Spin ◽  
Relaxation Dispersion ◽  
Proton Relaxation ◽  
Relaxation Processes ◽  
Molecular Reorientation ◽  
Cholesteric Phase

Abstract Field-cycling and standard pulsed NMR techniques have been used to study the frequency dependence of the longitudinal proton spin relaxation time T x in the crystalline estradiol compound (+)3,1,7-ß-bis-(4n-butoxybenzoyloxy)-estra-1,3,5-(10)-trien or BET, which is a mesogenic material with a chiral molecular structure. From the measured Larmor frequency and temperature depen-dences we conclude that, at low NMR frequencies in the cholesteric phase, T1 reflects in addition to the relaxation process familiar from nematic liquid crystals (director fluctuation modes) another slow mechanism theoretically predicted for cholesteric systems, namely diffusion induced rotational molecular reorientation. These relaxation processes are not or much less effective in the crystalline and glassy state, where they are frozen. Also the high NMR frequency relaxation dispersion strongly differs between the cholesteric mesophase and the not liquid crystalline samples. This is interpreted by a change from essentially translational self-diffusion to rotational diffusion controlled proton relaxation.

Nuclear Polarization and Impurity-State Spin Relaxation Processes in Silicon

1957 ◽  
Vol 106 (3) ◽  
pp. 489-498 ◽  
Author(s):  
David Pines ◽  
John Bardeen ◽  
Charles P. Slichter
Keyword(s):  
Spin Relaxation ◽  
Nuclear Polarization ◽  
Impurity State ◽  
Relaxation Processes ◽  
State Spin

scholarly journals Evolution of spin relaxation processes in LiY1−xHoxF4studied via ac-susceptibility and muon spin relaxation

2012 ◽  
Vol 86 (1) ◽  
Author(s):  
R. C. Johnson ◽  
B. Z. Malkin ◽  
J. S. Lord ◽  
S. R. Giblin ◽  
A. Amato ◽  
...  
Keyword(s):  
Spin Relaxation ◽  
Muon Spin ◽  
Ac Susceptibility ◽  
Muon Spin Relaxation ◽  
Relaxation Processes

scholarly journals Dipolar spin relaxation of divacancy qubits in silicon carbide

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Oscar Bulancea-Lindvall ◽  
Nguyen T. Son ◽  
Igor A. Abrikosov ◽  
Viktor Ivády
Keyword(s):  
Magnetic Field ◽  
Silicon Carbide ◽  
Relaxation Time ◽  
Spin Relaxation ◽  
Theoretical Study ◽  
Coherence Time ◽  
The Other ◽  
Relaxation Processes ◽  
Nuclear Spins ◽  
Open Questions

AbstractDivacancy spins implement qubits with outstanding characteristics and capabilities in an industrial semiconductor host. On the other hand, there are still numerous open questions about the physics of these important defects, for instance, spin relaxation has not been thoroughly studied yet. Here, we carry out a theoretical study on environmental spin-induced spin relaxation processes of divacancy qubits in the 4H polytype of silicon carbide (4H-SiC). We reveal all the relevant magnetic field values where the longitudinal spin relaxation time T1 drops resonantly due to the coupling to either nuclear spins or electron spins. We quantitatively analyze the dependence of the T1 time on the concentration of point defect spins and the applied magnetic field and provide an analytical expression. We demonstrate that dipolar spin relaxation plays a significant role both in as-grown and ion-implanted samples and it often limits the coherence time of divacancy qubits in 4H-SiC.

The duality of electron spin and resistivity relaxation processes in sodium and potassium metals

1984 ◽  
Vol 395 (1809) ◽  
pp. 341-351 ◽  
Keyword(s):  
Electrical Resistivity ◽  
Temperature Dependence ◽  
Spin Relaxation ◽  
Electron Spin ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Striking Similarity ◽  
Relaxation Processes ◽  
Electron Spin Relaxation ◽  
Sodium And Potassium

Electron spin resonance (e. s. r.) spectra of small particles ( ca . 500 nm) of sodium and potassium metals have been recorded over the temperature range 4─100 K. Analysis of the e. s. r. lineshapes yields values of the electron spin-lattice relaxation rate T -1 1 . Both electron spin relaxation and electrical resistivity in the alkalis are governed by the scattering of high velocity conduction electrons by lattice phonons. The temperature dependence of T -1 1 bears a striking similarity to that of the electrical resistivity. In both cases the temperature dependence is adequately described by a Bloch-Grüneisen function for temperatures above ½ θ , where θ is the Debye temperature. If a Debye model is used to approximate the behaviour of lattice vibrational modes, the derived Debye temperatures from the spin relaxation data are about 20% lower in the particulate samples of sodium and potassium than in the corresponding bulk metals.

Spin Relaxation Spectroscopy of the D-Center in Hydrogenated Amorphous Silicon

1989 ◽  
Vol 149 ◽  
Author(s):  
Sufi Zafar ◽  
E. A. Schiff
Keyword(s):  
Amorphous Silicon ◽  
Spin Relaxation ◽  
Hydrogenated Amorphous Silicon ◽  
Relaxation Processes ◽  
Substantial Variation ◽  
Paramagnetic Resonance ◽  
Electron Spin Relaxation ◽  
Order Of Magnitude ◽  
Hydrogenated Amorphous ◽  
Electron Paramagnetic

ABSTRACTMeasurements of the dependence of the D-center electron paramagnetic resonance absorption signal upon the incident microwave power are reported in undoped hydrogenated amorphous silicon (a-Si:H) for specimens prepared at differing deposition temperatures and also as the state of a given specimen was varied by illumination and subsequent annealing. These measurements are sensitive to electron spin relaxation processes of the D-center. Substantial variation in spin-relaxation behavior was found, corresponding to approximately one order of magnitude in the spin relaxation rate; no significant variations in absorption lineshape were observed. A model for these spin relaxation observations invoking two differing local microstructures near the D-center is proposed. The model indicates that illumination increases the density of defects in one microstructure but can irreversibly diminish the density in a second.

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