Does the temperature dependence at constant volume of the hyperfine field of heavy impurities in ferromagnetic metals depend explicitly upon the amplitude of lattice vibrations?

1983 ◽  
Vol 15 (1-4) ◽  
pp. 301-304
Author(s):  
P. C. Riedi ◽  
G. D. Webber
Keyword(s):  
Hyperfine Field ◽  
Temperature Dependence ◽  
Constant Volume ◽  
Lattice Vibrations ◽  
Ferromagnetic Metals

Temperature dependence of the hyperfine field in amorphous Fe2O3

1978 ◽  
Vol 27 (2) ◽  
pp. 121-125 ◽  
Author(s):  
A.M. van Diepen ◽  
Th.J.A. Popma
Keyword(s):  
Hyperfine Field ◽  
Temperature Dependence

Calculation of NQR v's and T1-1' s being proportional to T4 and T5 , respectively

1990 ◽  
Vol 45 (3-4) ◽  
pp. 536-540
Author(s):  
Mariusz Máckowiak ◽  
Costas Dimitropoulos
Keyword(s):  
Temperature Dependence ◽  
Relaxation Rate ◽  
Spin System ◽  
Low Frequency ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Lattice Vibrations ◽  
Spin Lattice ◽  
Simplifying Assumptions ◽  
The One

Abstract The second-order Raman phonon process for a multilevel spin system is shown to give a quadru-polar spin-lattice relaxation rate T1-1varying as T5 at very low temperatures. This relaxation rate for quadrupole spins is similar to the one discussed for a paramagnetic spin system having a multilevel ground state. The temperature dependence of T1 is discussed on the basis of some simplifying assumptions about the nature of the lattice vibrations in the Debye approximation. This type of relaxation process has been observed below 20 K in tetramethylammonium hydrogen bis-trichloroacetate for the 35Cl T1-1 . Below 20 K the NQR frequency in the same crystal reveals a T4 temperature dependence due to the induced modulations of the vibrational and librational coordinates by the low-frequency acoustic phonons.

Temperature Dependence of the Co Hyperfine Field in

1974 ◽  
Author(s):  
I. Wang ◽  
T. J. Burch ◽  
J. I. Budnick ◽  
J. J. Murphy ◽  
J. A. Cannon
Keyword(s):  
Hyperfine Field ◽  
Temperature Dependence

Temperature dependence of57Fe hyperfine field in Gd: YIG

1990 ◽  
Vol 59 (1-4) ◽  
pp. 493-496 ◽  
Author(s):  
J. Englich ◽  
P. Novák ◽  
J. Kuriplach ◽  
H. Lütgemeier
Keyword(s):  
Hyperfine Field ◽  
Temperature Dependence

Temperature Dependence of the Exchange Splitting in Ferromagnetic Metals II. The Study of Stoner Excitations by the de Haas–van Alphen Effect

1974 ◽  
Vol 52 (8) ◽  
pp. 704-707 ◽  
Author(s):  
D. M. Edwards
Keyword(s):  
Temperature Dependence ◽  
Spin Wave ◽  
Itinerant Electron ◽  
Exchange Splitting ◽  
Ferromagnetic Metals

It is shown that the de Haas–van Alphen (dHvA) effect in ferromagnetic metals can give information about the Stoner T2 term in the temperature dependence of the magnetization, without interference from spin wave contributions. In particular, the temperature dependence of the dHvA frequency for a very weak itinerant electron ferromagnet could distinguish clearly between conflicting theories of these materials.

35Cl NQR Studies of Bismuth Trichloride

1997 ◽  
Vol 52 (8-9) ◽  
pp. 614-620
Author(s):  
P. K. Babu ◽  
J. Ramakrishna
Keyword(s):  
Temperature Dependence ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Positive Temperature Coefficient ◽  
Spin Lattice Relaxation ◽  
Positive Temperature ◽  
Lattice Vibrations ◽  
Spin Lattice ◽  
Quadrupole Resonance ◽  
35Cl Nqr

Abstract The temperature dependence of the 35Cl nuclear quadrupole resonance (NQR) frequency and spin lattice relaxation time (T1) are studied in crystalline BiCl3 , in the range 40-300 K. The positive temperature coefficient observed for one of the 35Cl resonances is explained in terms of the strong intermolecular interactions that exist in this compound. Variation of with temperature is found to be similar at the chemically inequivalent halogen sites. Semiclassical descriptions based on torsional oscillator dynamics are found to be inadequate for explaining the spin lattice relaxation. T1 (T) data follow an AT2 + BT3 type behaviour, indicating that the anharmonic nature of the lattice vibrations plays a significant role in determining the temperature dependence of T1 at high temperatures.

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