Electron spin-lattice relaxation in a true amorphous material : V4+ in V 2O5
نویسندگان
چکیده
2014 The electron spin-lattice relaxation time T1 of V4+ in amorphous V2O5 has been measured in the X-band between 1.4 K and 100 K : T1-1 = 39 T2 $$ ~056/T x dx sinh x We explain this behaviour using a process requiring one two-level system (T.L.S.) modulating the crystal field, and one phonon. The characteristic temperature 56 K must be associated not with the maximum energy of the T.L.S. but with the cut-off in the distribution of the asymmetry parameter 0394. Spin-lattice relaxation is thus able to give informations about the asymmetry. J. Physique 44 (1983) 77-85 JANVIER 1983, Classification Physics Abstracts 63.50 76.30D
منابع مشابه
Low-Temperature Nuclear Spin±Lattice Relaxation in Amorphous Materials
The low temperature nuclear spin±lattice relaxation mechanism caused by the effective interaction between nuclear spins and two-level systems (TLS), arising from a paramagnetic centre interaction with TLS by means of g-factor modulation and the electron±nuclear dipole±dipole interaction, is investigated. It is shown, that this mechanism of the nuclear spin±lattice relaxation is effective under ...
متن کاملMAGNETISATION AND ELECTRON SPIN RESONANCE STUDIES OF TETRAHEDRAL AMORPHOUS CARBON
The magnetisation and electron spin resonance (ESR) spectrum of two specimens of tetrahedral amorphous carbon (ta-C), deposited from a filtered cathodic arc, were measured over a wide temperature range. The magnetisation was found to consist of superparamagnetic, paramagnetic and diamagnetic contributions. The superparamagnetic contribution resembled that recently found in carbon prepared from ...
متن کاملLi Dynamics in Amorphous LiNbO3 as Probed by Solid State NMR on Different Length Scales
Long-range Li diffusion parameters of amorphous LiNbO3 are probed by Li two-time spin-alignment echo NMR spectroscopy which is sensitive to slow Li dynamics. The jump rates which were extracted from the spin-alignment echo decay curves exhibit Arrhenius behaviour between 293 K and 413 K. The activation energy (0.41(1) eV) is in good agreement with that of the high-temperature flank of the Li NM...
متن کاملSpin-Lattice Dynamics Simulation of Magnon-Phonon-Electron Heat Transfer on the Million Atom Scale
We develop an atomistic spin-lattice-dynamics model for simulating energy relaxation in magnetic materials. The model explicitly solves equations of motion for the atoms and spins, and includes interaction with electron excitations. We apply the model to simulate the dynamics of propagation of a compressive elastic wave in iron. We find that coupling between the lattice, spin, and electron degr...
متن کاملRsc_cp_c2cp43543h 1..5
The high-frequency reorientation dynamics of O–H bonds is investigated in various amorphous ices including eHDA (expanded high density amorphous ice), LDA-II (low density amorphous ice II) and HGW (hyperquenched glassy water) using H-NMR spin–lattice relaxation as a local probe. Both low density forms, HGW and LDA-II, show similar spin–lattice relaxation but differ in the thermal stability with...
متن کامل