Spin-lattice relaxation in an isotropic elastic continuum with spherical lattice waves and a cubic crystal field

1974 ◽  
Vol 9 (9) ◽  
pp. 3678-3704 ◽  
Author(s):  
E. R. Bernstein ◽  
D. R. Franceschett
Keyword(s):  
Crystal Field ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Elastic Continuum ◽  
Cubic Crystal ◽  
Spin Lattice ◽  
Lattice Waves

scholarly journals The Orbit?Lattice Interaction for Lanthanide Ions. II. Strain and Relaxation Time Predictions for Cubic Systems

1980 ◽  
Vol 33 (4) ◽  
pp. 733 ◽  
Author(s):  
DJ Newman
Keyword(s):  
Crystal Field ◽  
Lattice Relaxation ◽  
Lanthanide Ions ◽  
Spin Lattice Relaxation ◽  
Superposition Model ◽  
Unknown Parameters ◽  
Paramagnetic Resonance ◽  
Spin Lattice ◽  
Relaxation Experiments ◽  
Cubic Systems

An analysis of dynamic crystal field data for cubic systems is carried out in order to assess the possible usefulness of the superposition model in understanding the results of lattice strain and spin-lattice relaxation experiments. The data used in this work are the electron paramagnetic resonance (EPR) results for strained cubic crystals obtained by Buisson, Baker and their coworkers, and the spinlattice relaxation results obtained by Buisson, Stapleton and their coworkers. A method of generalizing the superposition model to take into account long range electrostatic contributions without introducing additional unknown parameters is proposed, and shown to give consistent results. It is concluded that differences between bulk and local strains must be taken into account in any model of the dynamic crystal field, if it is to achieve success.

Crystalline-field splittings in cerous magnesium nitrate*

1963 ◽  
Vol 272 (1350) ◽  
pp. 371-386 ◽  
Keyword(s):  
Crystal Field ◽  
Field Model ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Magnesium Nitrate ◽  
Spin Lattice Relaxation ◽  
Crystalline Field ◽  
Spin Lattice ◽  
Number Of Factors ◽  
Rare Earth Salts

Measurements of the magnetic susceptibility at low temperatures have been made on single crystals of cerous magnesium nitrate, with a view to determining the energies of the low-lying states and the coefficients of the crystalline potential. The analysis, in terms of a crystal field of C 3v symmetry acting on one 4 f electron, gives results which are qualitatively similar to those of Judd’s earlier work, but the relative magnitudes of the six coefficients which fit the data suggest that a simple ionic crystal field model does not in fact describe the properties completely. A similar analysis of susceptibility measurements over a wider temperature range, recently reported by Hellwege, indicates substantially the same conclusion. A number of factors generally omitted from the theory of rare-earth salts are considered, but more detailed calculations are required to decide which, if any, are important here. In spite of the uncertainties, the analysis gives quite a good estimate of the energy of the first excited doublet, (38 + 3)°, in reasonable agreement with the results of measurements of the spin-lattice relaxation time.

Further studies of the enhanced nuclear magnet TmPO 4

1989 ◽  
Vol 424 (1867) ◽  
pp. 245-254 ◽  
Keyword(s):  
Magnetic Resonance ◽  
Crystal Field ◽  
Lattice Relaxation ◽  
Zeeman Splitting ◽  
Chem Phys ◽  
Spin Lattice Relaxation ◽  
Relaxation Rates ◽  
Spin Lattice ◽  
Crystal Field Parameters ◽  
T Values

In thulium phosphate, TmPO 4 , the lowest levels of the manifold 3 H 6 , split by the crystal field, are a singlet, and a doublet, followed by another singlet. Measurements by Bleaney et al . ( Proc. R. Soc. Lond. A 387, 75(1983)) of enhanced nuclear magnetic resonance were fitted to these levels by using a set of crystal-field parameters and wave functions based on optical absorption measurements of Brecher et al . ( J. chem. Phys. 49, 3303 (1968)) on Eu 3+ in YPO 4 . Two other sets of parameters (Hodges: J. Phys. 44, 833 (1983); Becker et al.: J. chem. Phys. 81, 2872 (1984)) give similar levels, except that the two lowest singlets are interchanged. A fresh set of parameters (adjusted from those of Hodges) is shown to give the correct Zeeman splitting for the doublet, and to fit the enhanced nuclear resonance measurements. Measurements of phonon velocities and of acoustic magnetic resonance at 0.7 GHz are also reported at field strengths up to 3 T. Values of the direct spin-lattice relaxation rates derived from these measurements are compared with results from other methods. The Orbach-Aminov relaxation rate is discussed, together with that in some other enhanced nuclear paramagnets.

Anisotropic 2H-NMR spin-lattice relaxation in oriented bilayers of DMPC and DMPC + cholesterol

1992 ◽  
Vol 89 ◽  
pp. 237-242 ◽  
Author(s):  
MA Krajewski-Bertrand ◽  
Y Nakatani ◽  
G Ourisson ◽  
EJ Dufourc ◽  
A Milon
Keyword(s):  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
2H Nmr ◽  
Spin Lattice

Dispersion of proton spin-lattice relaxation in a cholesteric liquid crystal

1983 ◽  
Vol 44 (10) ◽  
pp. 1179-1184 ◽  
Author(s):  
M. Vilfan ◽  
R. Blinc ◽  
J. Dolinšek ◽  
M. Ipavec ◽  
G. Lahajnar ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Cholesteric Liquid Crystal ◽  
Lattice Relaxation ◽  
Proton Spin ◽  
Spin Lattice Relaxation ◽  
Spin Lattice
Sign in / Sign up

Export Citation Format

Share Document